* 'master' of https://github.com/sveltejs/svelte: (137 commits)
  -> v3.19.2
  fix lazy code breaks in build
  fit bitmask overflow initial dirty value in 'if' blocks (sveltejs#4507)
  add dev runtime warning for unknown slot names (sveltejs#4501)
  fix render fallback slot content due to whitespace (sveltejs#4500)
  docs: describe falsy and nullish attribute behavior (sveltejs#4498)
  in spread, distinguish never-updating and always-updating props (sveltejs#4487)
  chore: more specific typings, and add README note about Yarn (sveltejs#4483)
  update changelog
  check for unknown props even if component doesn't have writable props (sveltejs#4454)
  Bump codecov from 3.5.0 to 3.6.5 (sveltejs#4433)
  fix bitmask overflow for slot (sveltejs#4485)
  mark module variables as mutated or reassigned (sveltejs#4469)
  docs: referenced_from_script var value (sveltejs#4486)
  docs: clarify default prop behaviour (sveltejs#4460)
  site: turn fancybutton into custombutton (sveltejs#4476)
  update changelog
  exclude global variables from $capture_state (sveltejs#4475)
  -> v3.19.1
  don't treat $$-names as stores during invalidation (sveltejs#4453)
  ...

* upstream/master: (190 commits)
  invalidate $$props and $$restProps only when there are changes (sveltejs#5123)
  site: use https in link in blog (sveltejs#5148)
  Simplify each block bindings example (sveltejs#5094)
  fix $$props reactive for slots (sveltejs#5125)
  site: add FAQ entry for how to document a svelte component (sveltejs#5131)
  site: remove an obsolete TODO in blog post (sveltejs#5135)
  Increase timeout for unit build
  Increase timeout for unit tests
  -> v3.24.0
  spread condition for input element (sveltejs#5004)
  update changelog
  fix(5018): compare wholeText instead of data (sveltejs#5028)
  html anchor in head (sveltejs#5071)
  error on expression scope store (sveltejs#5079)
  update changelog
  preprocess self-closing script and style tags (sveltejs#5082)
  update changelog
  fix: Parameters with default values are optional (sveltejs#5083)
  make builds time out after a reasonable period (sveltejs#5100)
  site: fix blog typo (sveltejs#5090)
  ...

* 'master' of github.com:hontas/svelte:

* upstream/master:
  add updating guard to binding callback (sveltejs#5126)
  Bump lodash from 4.17.15 to 4.17.19 (sveltejs#5152)
  Bump lodash from 4.17.15 to 4.17.19 in /site (sveltejs#5155)
  Fixes sveltejs#5153 (sveltejs#5154)

* upstream/master: (140 commits)
  support $$props and $$restProps for custom elements (sveltejs#5608)
  Bump eslint-config to 5.5.0 (sveltejs#5599)
  update changelog
  add Node and Element as known globals (sveltejs#5601)
  docs: fix a11y warning in media elements example (sveltejs#5606)
  Curly braces linting fixes (sveltejs#5585)
  refactor sourcemap and preprocessor tests (sveltejs#5583)
  -> v3.29.4
  fix code generation error with nullish coalescing operator and logical operators (sveltejs#5564)
  -> v3.29.3
  -> v3.29.2
  -> v3.29.1
  docs: fix a11y warning in media elements tutorial (sveltejs#5523)
  update changelog
  get context at start of {#if} update block instead of at the end (sveltejs#5531)
  update changelog
  only allow passing functions to lifecycle functions (sveltejs#5529)
  update changelog
  fix compiler hanging on <slot slot="..."> (sveltejs#5536)
  Add svelte@next caveat to bug report template (sveltejs#5561)
  ...

* 'master' of https://github.com/sveltejs/svelte: (129 commits)
  -> v3.32.3
  fix remove of lone :host selectors (sveltejs#5984)
  -> v3.32.2
  update changelog
  fix extra invalidation with component prop binding to object property (sveltejs#5890)
  update css-tree@^1.1.2 (sveltejs#5958)
  fix :host and :global css scoping (sveltejs#5957)
  Tutorial : a better explanation of component events (sveltejs#4639)
  "What's new in Svelte" February newsletter (sveltejs#5925)
  Change color on 404 page (sveltejs#5932)
  -> v3.32.1
  warn module variables are nonreactive and make them truly nonreactive (sveltejs#5847)
  update changelog
  fix: "foreign" namespace elements should still allow binding 'this' (sveltejs#5942)
  inline `prop_values` in `init` helper (sveltejs#5909)
  update changelog
  don't create class update functions when dependencies aren't reactive (sveltejs#5926)
  fix extraneous store subscription in SSR (sveltejs#5929)
  make `SvelteComponentDev` typings more forgiving (sveltejs#5937)
  make animation/transition params optional (sveltejs#5936)
  ...

- Call onMount in connectedCallback for customElements
- register onMount return values as on_disconnect-callbacks for customElements
- run on_disconnect callbacks in disconnectedCallback

- pass options.customElement down to mount_component
- remove expensive isCustomElement check
- only call add_render_callback if not customElement