diff --git a/internal/warpc/js/greet.bundle.js b/internal/warpc/js/greet.bundle.js
index 0237823edcf..04a924bcc51 100644
--- a/internal/warpc/js/greet.bundle.js
+++ b/internal/warpc/js/greet.bundle.js
@@ -1,2 +1,2 @@
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-`),e=new Uint8Array(c);Javy.IO.writeSync(1,e)}var w=function(r){s({id:r.id,greeting:"Hello "+r.name+"!"})};f(w);})();
+(()=>{function c(r){let e=[],i=new Uint8Array(1024);for(;;){let n=0;try{n=Javy.IO.readSync(0,i)}catch(o){if(o.message.includes("os error 29"))break;throw new Error("Error reading from stdin")}if(n<0)throw new Error("Error reading from stdin");if(n===0)break;e=[...e,...i.subarray(0,n)];let t=0;for(let o=0;t<e.length;t++)if(e[t]===10){let f=e.splice(o,t+1),s=new Uint8Array(f),u=JSON.parse(new TextDecoder().decode(s));r(u),o=t+1}e=e.slice(t)}}function d(r){let a=new TextEncoder().encode(JSON.stringify(r)+`
+`),e=new Uint8Array(a);Javy.IO.writeSync(1,e)}var w=function(r){d({header:r.header,data:{greeting:"Hello "+r.data.name+"!"}})};c(w);})();
diff --git a/internal/warpc/js/greet.js b/internal/warpc/js/greet.js
index 2a1608e2167..fc6e758341c 100644
--- a/internal/warpc/js/greet.js
+++ b/internal/warpc/js/greet.js
@@ -1,7 +1,7 @@
 import { readInput, writeOutput } from './common';
 
 const greet = function (input) {
-	writeOutput({ header: input.header, greeting: 'Hello ' + input.name + '!' });
+	writeOutput({ header: input.header, data: { greeting: 'Hello ' + input.data.name + '!' } });
 };
 
 readInput(greet);
diff --git a/internal/warpc/js/renderkatex.bundle.js b/internal/warpc/js/renderkatex.bundle.js
index ceb1e098aaa..b23ef243440 100644
--- a/internal/warpc/js/renderkatex.bundle.js
+++ b/internal/warpc/js/renderkatex.bundle.js
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this.expect("}"),this.nextToken=t,a}parseExpression(e,t){for(var a=[];;){this.mode==="math"&&this.consumeSpaces();var n=this.fetch();if(r.endOfExpression.indexOf(n.text)!==-1||t&&n.text===t||e&&L0[n.text]&&L0[n.text].infix)break;var s=this.parseAtom(t);if(s){if(s.type==="internal")continue}else break;a.push(s)}return this.mode==="text"&&this.formLigatures(a),this.handleInfixNodes(a)}handleInfixNodes(e){for(var t=-1,a,n=0;n<e.length;n++)if(e[n].type==="infix"){if(t!==-1)throw new M("only one infix operator per group",e[n].token);t=n,a=e[n].replaceWith}if(t!==-1&&a){var s,o,h=e.slice(0,t),c=e.slice(t+1);h.length===1&&h[0].type==="ordgroup"?s=h[0]:s={type:"ordgroup",mode:this.mode,body:h},c.length===1&&c[0].type==="ordgroup"?o=c[0]:o={type:"ordgroup",mode:this.mode,body:c};var p;return a==="\\\\abovefrac"?p=this.callFunction(a,[s,e[t],o],[]):p=this.callFunction(a,[s,o],[]),[p]}else return e}handleSupSubscript(e){var t=this.fetch(),a=t.text;this.consume(),this.consumeSpaces();var n=this.parseGroup(e);if(!n)throw new M("Expected group after '"+a+"'",t);return n}formatUnsupportedCmd(e){for(var t=[],a=0;a<e.length;a++)t.push({type:"textord",mode:"text",text:e[a]});var n={type:"text",mode:this.mode,body:t},s={type:"color",mode:this.mode,color:this.settings.errorColor,body:[n]};return s}parseAtom(e){var t=this.parseGroup("atom",e);if(this.mode==="text")return t;for(var a,n;;){this.consumeSpaces();var s=this.fetch();if(s.text==="\\limits"||s.text==="\\nolimits"){if(t&&t.type==="op"){var o=s.text==="\\limits";t.limits=o,t.alwaysHandleSupSub=!0}else if(t&&t.type==="operatorname")t.alwaysHandleSupSub&&(t.limits=s.text==="\\limits");else throw new M("Limit controls must follow a math operator",s);this.consume()}else if(s.text==="^"){if(a)throw new M("Double superscript",s);a=this.handleSupSubscript("superscript")}else if(s.text==="_"){if(n)throw new M("Double subscript",s);n=this.handleSupSubscript("subscript")}else if(s.text==="'"){if(a)throw new M("Double superscript",s);var h={type:"textord",mode:this.mode,text:"\\prime"},c=[h];for(this.consume();this.fetch().text==="'";)c.push(h),this.consume();this.fetch().text==="^"&&c.push(this.handleSupSubscript("superscript")),a={type:"ordgroup",mode:this.mode,body:c}}else if(Ce[s.text]){var p=yr.test(s.text),g=[];for(g.push(new p0(Ce[s.text])),this.consume();;){var y=this.fetch().text;if(!Ce[y]||yr.test(y)!==p)break;g.unshift(new p0(Ce[y])),this.consume()}var w=this.subparse(g);p?n={type:"ordgroup",mode:"math",body:w}:a={type:"ordgroup",mode:"math",body:w}}else break}return a||n?{type:"supsub",mode:this.mode,base:t,sup:a,sub:n}:t}parseFunction(e,t){var a=this.fetch(),n=a.text,s=L0[n];if(!s)return null;if(this.consume(),t&&t!=="atom"&&!s.allowedInArgument)throw new M("Got function '"+n+"' with no arguments"+(t?" as "+t:""),a);if(this.mode==="text"&&!s.allowedInText)throw new M("Can't use function '"+n+"' in text mode",a);if(this.mode==="math"&&s.allowedInMath===!1)throw new M("Can't use function '"+n+"' in math mode",a);var{args:o,optArgs:h}=this.parseArguments(n,s);return this.callFunction(n,o,h,a,e)}callFunction(e,t,a,n,s){var o={funcName:e,parser:this,token:n,breakOnTokenText:s},h=L0[e];if(h&&h.handler)return h.handler(o,t,a);throw new M("No function handler for "+e)}parseArguments(e,t){var a=t.numArgs+t.numOptionalArgs;if(a===0)return{args:[],optArgs:[]};for(var n=[],s=[],o=0;o<a;o++){var h=t.argTypes&&t.argTypes[o],c=o<t.numOptionalArgs;(t.primitive&&h==null||t.type==="sqrt"&&o===1&&s[0]==null)&&(h="primitive");var p=this.parseGroupOfType("argument to '"+e+"'",h,c);if(c)s.push(p);else if(p!=null)n.push(p);else throw new M("Null argument, please report this as a bug")}return{args:n,optArgs:s}}parseGroupOfType(e,t,a){switch(t){case"color":return this.parseColorGroup(a);case"size":return this.parseSizeGroup(a);case"url":return this.parseUrlGroup(a);case"math":case"text":return this.parseArgumentGroup(a,t);case"hbox":{var n=this.parseArgumentGroup(a,"text");return n!=null?{type:"styling",mode:n.mode,body:[n],style:"text"}:null}case"raw":{var s=this.parseStringGroup("raw",a);return s!=null?{type:"raw",mode:"text",string:s.text}:null}case"primitive":{if(a)throw new M("A primitive argument cannot be optional");var o=this.parseGroup(e);if(o==null)throw new M("Expected group as "+e,this.fetch());return o}case"original":case null:case void 0:return this.parseArgumentGroup(a);default:throw new M("Unknown group type as "+e,this.fetch())}}consumeSpaces(){for(;this.fetch().text===" ";)this.consume()}parseStringGroup(e,t){var a=this.gullet.scanArgument(t);if(a==null)return null;for(var n="",s;(s=this.fetch()).text!=="EOF";)n+=s.text,this.consume();return this.consume(),a.text=n,a}parseRegexGroup(e,t){for(var a=this.fetch(),n=a,s="",o;(o=this.fetch()).text!=="EOF"&&e.test(s+o.text);)n=o,s+=n.text,this.consume();if(s==="")throw new M("Invalid "+t+": '"+a.text+"'",a);return a.range(n,s)}parseColorGroup(e){var t=this.parseStringGroup("color",e);if(t==null)return null;var a=/^(#[a-f0-9]{3}|#?[a-f0-9]{6}|[a-z]+)$/i.exec(t.text);if(!a)throw new M("Invalid color: '"+t.text+"'",t);var n=a[0];return/^[0-9a-f]{6}$/i.test(n)&&(n="#"+n),{type:"color-token",mode:this.mode,color:n}}parseSizeGroup(e){var t,a=!1;if(this.gullet.consumeSpaces(),!e&&this.gullet.future().text!=="{"?t=this.parseRegexGroup(/^[-+]? *(?:$|\d+|\d+\.\d*|\.\d*) *[a-z]{0,2} *$/,"size"):t=this.parseStringGroup("size",e),!t)return null;!e&&t.text.length===0&&(t.text="0pt",a=!0);var n=/([-+]?) *(\d+(?:\.\d*)?|\.\d+) *([a-z]{2})/.exec(t.text);if(!n)throw new M("Invalid size: '"+t.text+"'",t);var s={number:+(n[1]+n[2]),unit:n[3]};if(!Sr(s))throw new M("Invalid unit: '"+s.unit+"'",t);return{type:"size",mode:this.mode,value:s,isBlank:a}}parseUrlGroup(e){this.gullet.lexer.setCatcode("%",13),this.gullet.lexer.setCatcode("~",12);var t=this.parseStringGroup("url",e);if(this.gullet.lexer.setCatcode("%",14),this.gullet.lexer.setCatcode("~",13),t==null)return null;var a=t.text.replace(/\\([#$%&~_^{}])/g,"$1");return{type:"url",mode:this.mode,url:a}}parseArgumentGroup(e,t){var a=this.gullet.scanArgument(e);if(a==null)return null;var n=this.mode;t&&this.switchMode(t),this.gullet.beginGroup();var s=this.parseExpression(!1,"EOF");this.expect("EOF"),this.gullet.endGroup();var o={type:"ordgroup",mode:this.mode,loc:a.loc,body:s};return t&&this.switchMode(n),o}parseGroup(e,t){var a=this.fetch(),n=a.text,s;if(n==="{"||n==="\\begingroup"){this.consume();var o=n==="{"?"}":"\\endgroup";this.gullet.beginGroup();var h=this.parseExpression(!1,o),c=this.fetch();this.expect(o),this.gullet.endGroup(),s={type:"ordgroup",mode:this.mode,loc:m0.range(a,c),body:h,semisimple:n==="\\begingroup"||void 0}}else if(s=this.parseFunction(t,e)||this.parseSymbol(),s==null&&n[0]==="\\"&&!da.hasOwnProperty(n)){if(this.settings.throwOnError)throw new M("Undefined control sequence: "+n,a);s=this.formatUnsupportedCmd(n),this.consume()}return s}formLigatures(e){for(var t=e.length-1,a=0;a<t;++a){var n=e[a],s=n.text;s==="-"&&e[a+1].text==="-"&&(a+1<t&&e[a+2].text==="-"?(e.splice(a,3,{type:"textord",mode:"text",loc:m0.range(n,e[a+2]),text:"---"}),t-=2):(e.splice(a,2,{type:"textord",mode:"text",loc:m0.range(n,e[a+1]),text:"--"}),t-=1)),(s==="'"||s==="`")&&e[a+1].text===s&&(e.splice(a,2,{type:"textord",mode:"text",loc:m0.range(n,e[a+1]),text:s+s}),t-=1)}}parseSymbol(){var e=this.fetch(),t=e.text;if(/^\\verb[^a-zA-Z]/.test(t)){this.consume();var a=t.slice(5),n=a.charAt(0)==="*";if(n&&(a=a.slice(1)),a.length<2||a.charAt(0)!==a.slice(-1))throw new M(`\\verb assertion failed --
-                    please report what input caused this bug`);return a=a.slice(1,-1),{type:"verb",mode:"text",body:a,star:n}}xr.hasOwnProperty(t[0])&&!$[this.mode][t[0]]&&(this.settings.strict&&this.mode==="math"&&this.settings.reportNonstrict("unicodeTextInMathMode",'Accented Unicode text character "'+t[0]+'" used in math mode',e),t=xr[t[0]]+t.slice(1));var s=l4.exec(t);s&&(t=t.substring(0,s.index),t==="i"?t="\u0131":t==="j"&&(t="\u0237"));var o;if($[this.mode][t]){this.settings.strict&&this.mode==="math"&&ct.indexOf(t)>=0&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+t[0]+'" used in math mode',e);var h=$[this.mode][t].group,c=m0.range(e),p;if(e1.hasOwnProperty(h)){var g=h;p={type:"atom",mode:this.mode,family:g,loc:c,text:t}}else p={type:h,mode:this.mode,loc:c,text:t};o=p}else if(t.charCodeAt(0)>=128)this.settings.strict&&(kr(t.charCodeAt(0))?this.mode==="math"&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+t[0]+'" used in math mode',e):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode character "'+t[0]+'"'+(" ("+t.charCodeAt(0)+")"),e)),o={type:"textord",mode:"text",loc:m0.range(e),text:t};else return null;if(this.consume(),s)for(var y=0;y<s[0].length;y++){var w=s[0][y];if(!ot[w])throw new M("Unknown accent ' "+w+"'",e);var x=ot[w][this.mode]||ot[w].text;if(!x)throw new M("Accent "+w+" unsupported in "+this.mode+" mode",e);o={type:"accent",mode:this.mode,loc:m0.range(e),label:x,isStretchy:!1,isShifty:!0,base:o}}return o}};Pe.endOfExpression=["}","\\endgroup","\\end","\\right","&"];var Ht=function(e,t){if(!(typeof e=="string"||e instanceof String))throw new TypeError("KaTeX can only parse string typed expression");var a=new Pe(e,t);delete a.gullet.macros.current["\\df@tag"];var n=a.parse();if(delete a.gullet.macros.current["\\current@color"],delete a.gullet.macros.current["\\color"],a.gullet.macros.get("\\df@tag")){if(!t.displayMode)throw new M("\\tag works only in display equations");n=[{type:"tag",mode:"text",body:n,tag:a.subparse([new p0("\\df@tag")])}]}return n},fa=function(e,t,a){t.textContent="";var n=Ft(e,a).toNode();t.appendChild(n)};typeof document<"u"&&document.compatMode!=="CSS1Compat"&&(typeof console<"u"&&console.warn("Warning: KaTeX doesn't work in quirks mode. Make sure your website has a suitable doctype."),fa=function(){throw new M("KaTeX doesn't work in quirks mode.")});var h4=function(e,t){var a=Ft(e,t).toMarkup();return a},m4=function(e,t){var a=new he(t);return Ht(e,a)},pa=function(e,t,a){if(a.throwOnError||!(e instanceof M))throw e;var n=b.makeSpan(["katex-error"],[new u0(t)]);return n.setAttribute("title",e.toString()),n.setAttribute("style","color:"+a.errorColor),n},Ft=function(e,t){var a=new he(t);try{var n=Ht(e,a);return k1(n,e,a)}catch(s){return pa(s,e,a)}},c4=function(e,t){var a=new he(t);try{var n=Ht(e,a);return S1(n,e,a)}catch(s){return pa(s,e,a)}},va={version:"0.16.11",render:fa,renderToString:h4,ParseError:M,SETTINGS_SCHEMA:qe,__parse:m4,__renderToDomTree:Ft,__renderToHTMLTree:c4,__setFontMetrics:ja,__defineSymbol:i,__defineFunction:B,__defineMacro:m,__domTree:{Span:W0,Anchor:ce,SymbolNode:u0,SvgNode:y0,PathNode:S0,LineNode:de}};var d4=function(r){let e=r.expression,t=r.id;delete r.expression,delete r.id,r.throwOnError=!1,Ut({id:t,output:va.renderToString(e,r)})};Vt(d4);})();
+                    please report what input caused this bug`);return a=a.slice(1,-1),{type:"verb",mode:"text",body:a,star:n}}xr.hasOwnProperty(t[0])&&!$[this.mode][t[0]]&&(this.settings.strict&&this.mode==="math"&&this.settings.reportNonstrict("unicodeTextInMathMode",'Accented Unicode text character "'+t[0]+'" used in math mode',e),t=xr[t[0]]+t.slice(1));var s=l4.exec(t);s&&(t=t.substring(0,s.index),t==="i"?t="\u0131":t==="j"&&(t="\u0237"));var o;if($[this.mode][t]){this.settings.strict&&this.mode==="math"&&ct.indexOf(t)>=0&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+t[0]+'" used in math mode',e);var h=$[this.mode][t].group,c=m0.range(e),p;if(e1.hasOwnProperty(h)){var g=h;p={type:"atom",mode:this.mode,family:g,loc:c,text:t}}else p={type:h,mode:this.mode,loc:c,text:t};o=p}else if(t.charCodeAt(0)>=128)this.settings.strict&&(kr(t.charCodeAt(0))?this.mode==="math"&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+t[0]+'" used in math mode',e):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode character "'+t[0]+'"'+(" ("+t.charCodeAt(0)+")"),e)),o={type:"textord",mode:"text",loc:m0.range(e),text:t};else return null;if(this.consume(),s)for(var y=0;y<s[0].length;y++){var w=s[0][y];if(!ot[w])throw new M("Unknown accent ' "+w+"'",e);var x=ot[w][this.mode]||ot[w].text;if(!x)throw new M("Accent "+w+" unsupported in "+this.mode+" mode",e);o={type:"accent",mode:this.mode,loc:m0.range(e),label:x,isStretchy:!1,isShifty:!0,base:o}}return o}};Pe.endOfExpression=["}","\\endgroup","\\end","\\right","&"];var Ht=function(e,t){if(!(typeof e=="string"||e instanceof String))throw new TypeError("KaTeX can only parse string typed expression");var a=new Pe(e,t);delete a.gullet.macros.current["\\df@tag"];var n=a.parse();if(delete a.gullet.macros.current["\\current@color"],delete a.gullet.macros.current["\\color"],a.gullet.macros.get("\\df@tag")){if(!t.displayMode)throw new M("\\tag works only in display equations");n=[{type:"tag",mode:"text",body:n,tag:a.subparse([new p0("\\df@tag")])}]}return n},fa=function(e,t,a){t.textContent="";var n=Ft(e,a).toNode();t.appendChild(n)};typeof document<"u"&&document.compatMode!=="CSS1Compat"&&(typeof console<"u"&&console.warn("Warning: KaTeX doesn't work in quirks mode. Make sure your website has a suitable doctype."),fa=function(){throw new M("KaTeX doesn't work in quirks mode.")});var h4=function(e,t){var a=Ft(e,t).toMarkup();return a},m4=function(e,t){var a=new he(t);return Ht(e,a)},pa=function(e,t,a){if(a.throwOnError||!(e instanceof M))throw e;var n=b.makeSpan(["katex-error"],[new u0(t)]);return n.setAttribute("title",e.toString()),n.setAttribute("style","color:"+a.errorColor),n},Ft=function(e,t){var a=new he(t);try{var n=Ht(e,a);return k1(n,e,a)}catch(s){return pa(s,e,a)}},c4=function(e,t){var a=new he(t);try{var n=Ht(e,a);return S1(n,e,a)}catch(s){return pa(s,e,a)}},va={version:"0.16.11",render:fa,renderToString:h4,ParseError:M,SETTINGS_SCHEMA:qe,__parse:m4,__renderToDomTree:Ft,__renderToHTMLTree:c4,__setFontMetrics:ja,__defineSymbol:i,__defineFunction:B,__defineMacro:m,__domTree:{Span:W0,Anchor:ce,SymbolNode:u0,SvgNode:y0,PathNode:S0,LineNode:de}};var d4=function(r){let e=r.data,t=e.expression,a=e.options;a.throwOnError=!0,Ut({header:r.header,data:{output:va.renderToString(t,a)}})};Vt(d4);})();
diff --git a/internal/warpc/js/renderkatex.js b/internal/warpc/js/renderkatex.js
index 206dae8517f..0fef40a71ed 100644
--- a/internal/warpc/js/renderkatex.js
+++ b/internal/warpc/js/renderkatex.js
@@ -2,14 +2,11 @@ import { readInput, writeOutput } from './common';
 import katex from 'katex';
 
 const render = function (input) {
-	const expression = input.expression;
-	const id = input.id;
-	delete input.expression;
-	delete input.id;
-	input.throwOnError = false;
-	writeOutput({ id: id, output: katex.renderToString(expression, input) });
+	const data = input.data;
+	const expression = data.expression;
+	const options = data.options;
+	options.throwOnError = true;
+	writeOutput({ header: input.header, data: { output: katex.renderToString(expression, options) } });
 };
 
-(() => {
-	readInput(render);
-})();
+readInput(render);
diff --git a/internal/warpc/katex.go b/internal/warpc/katex.go
index 5fca9b70973..6a860af208f 100644
--- a/internal/warpc/katex.go
+++ b/internal/warpc/katex.go
@@ -20,21 +20,15 @@ func StartKatex() (Dispatcher[KatexInput, KatexOutput], error) {
 
 // See https://katex.org/docs/options.html
 type KatexInput struct {
-	ID          uint32 `json:"id"`
-	Expression  string `json:"expression"`
+	Expression string       `json:"expression"`
+	Options    KatexOptions `json:"options"`
+}
+
+type KatexOptions struct {
 	Output      string `json:"output"` // html, mathml, htmlAndMathml (default)
 	DisplayMode bool   `json:"displayMode"`
 }
 
 type KatexOutput struct {
-	ID     uint32 `json:"id"`
 	Output string `json:"output"`
 }
-
-func (k KatexOutput) GetID() uint32 {
-	return k.ID
-}
-
-func (k KatexInput) GetID() uint32 {
-	return k.ID
-}
diff --git a/internal/warpc/warpc.go b/internal/warpc/warpc.go
index 16a34ca0000..51bcd5c45f9 100644
--- a/internal/warpc/warpc.go
+++ b/internal/warpc/warpc.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"os"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -32,12 +33,22 @@ type Header struct {
 	ID      uint32 `json:"id"`
 }
 
+type Message[T any] struct {
+	Header Header `json:"header"`
+	Data   T      `json:"data"`
+}
+
+func (m Message[T]) GetID() uint32 {
+	return m.Header.ID
+}
+
+// TODO1 remove me.
 type IDGetter interface {
 	GetID() uint32
 }
 
-type Dispatcher[Q, R IDGetter] interface {
-	Execute(ctx context.Context, q Q) (R, error)
+type Dispatcher[Q, R any] interface {
+	Execute(ctx context.Context, q Message[Q]) (Message[R], error)
 	Close() error
 }
 
@@ -50,8 +61,8 @@ func (p *dispatcherPool[Q, R]) Close() error {
 	return p.close()
 }
 
-type dispatcher[Q, R IDGetter] struct {
-	zero R
+type dispatcher[Q, R any] struct {
+	zero Message[R]
 
 	mu    sync.RWMutex
 	encMu sync.Mutex
@@ -96,7 +107,7 @@ func putTimer(t *time.Timer) {
 }
 
 // Execute sends a request to the dispatcher and waits for the response.
-func (p *dispatcherPool[Q, R]) Execute(ctx context.Context, q Q) (R, error) {
+func (p *dispatcherPool[Q, R]) Execute(ctx context.Context, q Message[Q]) (Message[R], error) {
 	d := p.getDispatcher()
 	if q.GetID() == 0 {
 		return d.zero, errors.New("ID must not be 0 (note that this must be unique within the current request set time window)")
@@ -127,7 +138,7 @@ func (p *dispatcherPool[Q, R]) Execute(ctx context.Context, q Q) (R, error) {
 	return call.Response, nil
 }
 
-func (d *dispatcher[Q, R]) newCall(q Q) (*call[Q, R], error) {
+func (d *dispatcher[Q, R]) newCall(q Message[Q]) (*call[Q, R], error) {
 	call := &call[Q, R]{
 		Done:    make(chan *call[Q, R], 1),
 		Request: q,
@@ -167,7 +178,7 @@ func (d *dispatcher[Q, R]) input() {
 	var inputErr error
 
 	for d.inOut.dec.More() {
-		var r R
+		var r Message[R]
 		if err := d.inOut.dec.Decode(&r); err != nil {
 			inputErr = err
 			break
@@ -207,8 +218,8 @@ func (d *dispatcher[Q, R]) input() {
 }
 
 type call[Q, R any] struct {
-	Request  Q
-	Response R
+	Request  Message[Q]
+	Response Message[R]
 	Error    error
 	Done     chan *call[Q, R]
 }
@@ -262,7 +273,8 @@ type CompiledModule struct {
 	Module wazero.CompiledModule
 }
 
-func Start[Q, R IDGetter](opts Options) (Dispatcher[Q, R], error) {
+// TODO1 do a test release build to verify that this compiles for all OSes.c
+func Start[Q, R any](opts Options) (Dispatcher[Q, R], error) {
 	if opts.Main.Data == nil {
 		return nil, errors.New("Main.Data must be set")
 	}
@@ -281,13 +293,13 @@ func Start[Q, R IDGetter](opts Options) (Dispatcher[Q, R], error) {
 	return newDispatcher[Q, R](opts)
 }
 
-type dispatcherPool[Q, R IDGetter] struct {
+type dispatcherPool[Q, R any] struct {
 	counter     atomic.Uint32
 	dispatchers []*dispatcher[Q, R]
 	close       func() error
 }
 
-func newDispatcher[Q, R IDGetter](opts Options) (*dispatcherPool[Q, R], error) {
+func newDispatcher[Q, R any](opts Options) (*dispatcherPool[Q, R], error) {
 	if opts.Ctx == nil {
 		opts.Ctx = context.Background()
 	}
@@ -350,7 +362,8 @@ func newDispatcher[Q, R IDGetter](opts Options) (*dispatcherPool[Q, R], error) {
 		for _, c := range inOuts {
 			c := c
 			g.Go(func() error {
-				configBase := wazero.NewModuleConfig().WithStdout(c.stdout).WithStdin(c.stdin).WithStartFunctions()
+				ctx := context.WithoutCancel(ctx)
+				configBase := wazero.NewModuleConfig().WithStderr(os.Stderr).WithStdout(c.stdout).WithStdin(c.stdin).WithStartFunctions()
 				if opts.Runtime.Data != nil {
 					// This needs to be anonymous, it will be resolved in the import resolver below.
 					runtimeInstance, err := r.InstantiateModule(ctx, runtimeModule, configBase.WithName(""))
@@ -367,7 +380,7 @@ func newDispatcher[Q, R IDGetter](opts Options) (*dispatcherPool[Q, R], error) {
 					)
 				}
 
-				mainInstance, err := r.InstantiateModule(ctx, mainModule, configBase.WithName("").WithStdout(c.stdout).WithStdin(c.stdin))
+				mainInstance, err := r.InstantiateModule(ctx, mainModule, configBase.WithName(""))
 				if err != nil {
 					return err
 				}
diff --git a/internal/warpc/warpc_test.go b/internal/warpc/warpc_test.go
index 3c46a543465..3c97a882ba4 100644
--- a/internal/warpc/warpc_test.go
+++ b/internal/warpc/warpc_test.go
@@ -13,14 +13,9 @@ import (
 var greetWasm []byte
 
 type person struct {
-	ID   uint32 `json:"id"`
 	Name string `json:"name"`
 }
 
-func (p person) GetID() uint32 {
-	return p.ID
-}
-
 func TestKatex(t *testing.T) {
 	opts := Options{
 		Runtime: quickjsBinary,
@@ -36,18 +31,28 @@ func TestKatex(t *testing.T) {
 	ctx := context.Background()
 
 	input := KatexInput{
-		ID:          uint32(32),
-		Expression:  "c = \\pm\\sqrt{a^2 + b^2}",
-		DisplayMode: true,
+		Expression: "c = \\pm\\sqrt{a^2 + b^2}",
+		Options: KatexOptions{
+			Output:      "html",
+			DisplayMode: true,
+		},
 	}
 
-	result, err := d.Execute(ctx, input)
+	message := Message[KatexInput]{
+		Header: Header{
+			Version: currentVersion,
+			ID:      uint32(32),
+		},
+		Data: input,
+	}
+
+	result, err := d.Execute(ctx, message)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if result.ID != input.ID {
-		t.Fatalf("%d vs %d", result.ID, input.ID)
+	if result.GetID() != message.GetID() {
+		t.Fatalf("%d vs %d", result.GetID(), message.GetID())
 	}
 }
 
@@ -67,21 +72,26 @@ func TestGreet(t *testing.T) {
 
 		ctx := context.Background()
 
-		inputPerson := person{
-			Name: "Person",
+		inputMessage := Message[person]{
+			Header: Header{
+				Version: currentVersion,
+			},
+			Data: person{
+				Name: "Person",
+			},
 		}
 
 		for j := 0; j < 20; j++ {
-			inputPerson.ID = uint32(j + 1)
-			g, err := d.Execute(ctx, inputPerson)
+			inputMessage.Header.ID = uint32(j + 1)
+			g, err := d.Execute(ctx, inputMessage)
 			if err != nil {
 				t.Fatal(err)
 			}
-			if g.Greeting != "Hello Person!" {
+			if g.Data.Greeting != "Hello Person!" {
 				t.Fatalf("got: %v", g)
 			}
-			if g.ID != inputPerson.ID {
-				t.Fatalf("%d vs %d", g.ID, inputPerson.ID)
+			if g.GetID() != inputMessage.GetID() {
+				t.Fatalf("%d vs %d", g.GetID(), inputMessage.GetID())
 			}
 
 		}
@@ -94,7 +104,7 @@ func TestGreetParallel(t *testing.T) {
 		Main:     greetBinary,
 		PoolSize: 4,
 	}
-	d, err := Start[*person, greeting](opts)
+	d, err := Start[person, greeting](opts)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -113,21 +123,27 @@ func TestGreetParallel(t *testing.T) {
 				base := i * 100
 				id := uint32(base + j)
 
-				inputPerson := &person{
+				inputPerson := person{
 					Name: fmt.Sprintf("Person %d", id),
-					ID:   id,
 				}
-				g, err := d.Execute(ctx, inputPerson)
+				inputMessage := Message[person]{
+					Header: Header{
+						Version: currentVersion,
+						ID:      id,
+					},
+					Data: inputPerson,
+				}
+				g, err := d.Execute(ctx, inputMessage)
 				if err != nil {
 					t.Error(err)
 					return
 				}
-				if g.Greeting != fmt.Sprintf("Hello Person %d!", id) {
+				if g.Data.Greeting != fmt.Sprintf("Hello Person %d!", id) {
 					t.Errorf("got: %v", g)
 					return
 				}
-				if g.ID != inputPerson.ID {
-					t.Errorf("%d vs %d", g.ID, inputPerson.ID)
+				if g.GetID() != inputMessage.GetID() {
+					t.Errorf("%d vs %d", g.GetID(), inputMessage.GetID())
 					return
 				}
 			}
@@ -164,16 +180,22 @@ func TestKatexParallel(t *testing.T) {
 				id := uint32(base + j)
 
 				input := katexInputTemplate
-				input.ID = id
+				inputMessage := Message[KatexInput]{
+					Header: Header{
+						Version: currentVersion,
+						ID:      id,
+					},
+					Data: input,
+				}
 
-				result, err := d.Execute(ctx, input)
+				result, err := d.Execute(ctx, inputMessage)
 				if err != nil {
 					t.Error(err)
 					return
 				}
 
-				if result.ID != input.ID {
-					t.Errorf("%d vs %d", result.ID, input.ID)
+				if result.GetID() != inputMessage.GetID() {
+					t.Errorf("%d vs %d", result.GetID(), inputMessage.GetID())
 					return
 				}
 			}
@@ -189,7 +211,7 @@ func BenchmarkExecuteKatex(b *testing.B) {
 		Runtime: quickjsBinary,
 		Main:    katexBinary,
 	}
-	d, err := Start[*KatexInput, KatexOutput](opts)
+	d, err := Start[KatexInput, KatexOutput](opts)
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -197,18 +219,25 @@ func BenchmarkExecuteKatex(b *testing.B) {
 
 	ctx := context.Background()
 
-	input := &katexInputTemplate
+	input := katexInputTemplate
 
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		input.ID = uint32(i + 1)
-		result, err := d.Execute(ctx, input)
+		message := Message[KatexInput]{
+			Header: Header{
+				Version: currentVersion,
+				ID:      uint32(i + 1),
+			},
+			Data: input,
+		}
+
+		result, err := d.Execute(ctx, message)
 		if err != nil {
 			b.Fatal(err)
 		}
 
-		if result.ID != input.ID {
-			b.Fatalf("%d vs %d", result.ID, input.ID)
+		if result.GetID() != message.GetID() {
+			b.Fatalf("%d vs %d", result.GetID(), message.GetID())
 		}
 
 	}
@@ -247,9 +276,8 @@ func BenchmarkKatexStartStop(b *testing.B) {
 }
 
 var katexInputTemplate = KatexInput{
-	Expression:  "c = \\pm\\sqrt{a^2 + b^2}",
-	DisplayMode: true,
-	Output:      "html",
+	Expression: "c = \\pm\\sqrt{a^2 + b^2}",
+	Options:    KatexOptions{Output: "html", DisplayMode: true},
 }
 
 func BenchmarkExecuteKatexPara(b *testing.B) {
@@ -272,14 +300,20 @@ func BenchmarkExecuteKatexPara(b *testing.B) {
 		var id atomic.Uint32
 		b.RunParallel(func(pb *testing.PB) {
 			for pb.Next() {
-				input := katexInputTemplate
-				input.ID = id.Add(1)
-				result, err := d.Execute(ctx, input)
+				message := Message[KatexInput]{
+					Header: Header{
+						Version: currentVersion,
+						ID:      id.Add(1),
+					},
+					Data: katexInputTemplate,
+				}
+
+				result, err := d.Execute(ctx, message)
 				if err != nil {
 					b.Fatal(err)
 				}
-				if result.ID != input.ID {
-					b.Fatalf("%d vs %d", result.ID, input.ID)
+				if result.GetID() != message.GetID() {
+					b.Fatalf("%d vs %d", result.GetID(), message.GetID())
 				}
 			}
 		})
@@ -301,7 +335,7 @@ func BenchmarkExecuteGreet(b *testing.B) {
 		Runtime: quickjsBinary,
 		Main:    greetBinary,
 	}
-	d, err := Start[*person, greeting](opts)
+	d, err := Start[person, greeting](opts)
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -309,20 +343,26 @@ func BenchmarkExecuteGreet(b *testing.B) {
 
 	ctx := context.Background()
 
-	input := &person{
+	input := person{
 		Name: "Person",
 	}
 
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		input.ID = uint32(i + 1)
-		result, err := d.Execute(ctx, input)
+		message := Message[person]{
+			Header: Header{
+				Version: currentVersion,
+				ID:      uint32(i + 1),
+			},
+			Data: input,
+		}
+		result, err := d.Execute(ctx, message)
 		if err != nil {
 			b.Fatal(err)
 		}
 
-		if result.ID != input.ID {
-			b.Fatalf("%d vs %d", result.ID, input.ID)
+		if result.GetID() != message.GetID() {
+			b.Fatalf("%d vs %d", result.GetID(), message.GetID())
 		}
 
 	}
@@ -352,28 +392,29 @@ func BenchmarkExecuteGreetPara(b *testing.B) {
 	var id atomic.Uint32
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {
-			input := inputTemplate
-			input.ID = id.Add(1)
-			result, err := d.Execute(ctx, input)
+			message := Message[person]{
+				Header: Header{
+					Version: currentVersion,
+					ID:      id.Add(1),
+				},
+				Data: inputTemplate,
+			}
+
+			result, err := d.Execute(ctx, message)
 			if err != nil {
 				b.Fatal(err)
 			}
-			if result.ID != input.ID {
-				b.Fatalf("%d vs %d", result.ID, input.ID)
+			if result.GetID() != message.GetID() {
+				b.Fatalf("%d vs %d", result.GetID(), message.GetID())
 			}
 		}
 	})
 }
 
 type greeting struct {
-	ID       uint32 `json:"id"`
 	Greeting string `json:"greeting"`
 }
 
-func (g greeting) GetID() uint32 {
-	return g.ID
-}
-
 var (
 	greetBinary = Binary{
 		Name: "greet",
diff --git a/internal/warpc/wasm/greet.wasm b/internal/warpc/wasm/greet.wasm
index 77cf5906a8a..4cce75aefe9 100644
Binary files a/internal/warpc/wasm/greet.wasm and b/internal/warpc/wasm/greet.wasm differ
diff --git a/internal/warpc/wasm/renderkatex.wasm b/internal/warpc/wasm/renderkatex.wasm
index 0aa6e84a845..8d99245fe21 100644
Binary files a/internal/warpc/wasm/renderkatex.wasm and b/internal/warpc/wasm/renderkatex.wasm differ
diff --git a/tpl/transform/transform.go b/tpl/transform/transform.go
index 8a9486b31c4..ca71b121873 100644
--- a/tpl/transform/transform.go
+++ b/tpl/transform/transform.go
@@ -24,6 +24,7 @@ import (
 	"sync/atomic"
 
 	"github.com/gohugoio/hugo/cache/dynacache"
+	"github.com/gohugoio/hugo/internal/warpc"
 	"github.com/gohugoio/hugo/markup/converter/hooks"
 	"github.com/gohugoio/hugo/markup/highlight"
 	"github.com/gohugoio/hugo/markup/highlight/chromalexers"
@@ -41,7 +42,7 @@ func New(deps *deps.Deps) *Namespace {
 		panic("must provide MemCache")
 	}
 
-	katexDispatcher, err := ext.StartKatex() // TODO1 Close. Also start this on demand.
+	katexDispatcher, err := warpc.StartKatex() // TODO1 Close. Also start this on demand.
 	if err != nil {
 		panic(err)
 	}
@@ -61,7 +62,7 @@ func New(deps *deps.Deps) *Namespace {
 type Namespace struct {
 	cache           *dynacache.Partition[string, *resources.StaleValue[any]]
 	id              atomic.Uint32
-	katexDispatcher ext.Dispatcher[ext.KatexInput, ext.KatexOutput]
+	katexDispatcher warpc.Dispatcher[warpc.KatexInput, warpc.KatexOutput]
 	deps            *deps.Deps
 }
 
@@ -200,18 +201,22 @@ func (ns *Namespace) ToMathML(ctx context.Context, s any) (string, error) {
 
 	// TODO1 compiler cache.
 	// TODO1 cache.
-	input := ext.KatexInput{
-		ID:          ns.id.Add(1),
-		Expression:  ss,
-		Output:      "mathml",
-		DisplayMode: true,
-	}
-
-	result, err := ns.katexDispatcher.Execute(ctx, input)
+	message := warpc.Message[warpc.KatexInput]{
+		Header: warpc.Header{
+			Version: "v1",
+			ID:      ns.id.Add(1),
+		},
+		Data: warpc.KatexInput{
+			Expression: ss,
+			Options:    warpc.KatexOptions{Output: "mathml", DisplayMode: true},
+		},
+	}
+
+	result, err := ns.katexDispatcher.Execute(ctx, message)
 	if err != nil {
 		return "", err
 	}
-	return result.Output, nil
+	return result.Data.Output, nil
 }
 
 // For internal use.