perf(fetch): improve body mixin methods

[tsctx]

Optimize arrayBuffer of Body mixin.

• main

benchmark                 time (avg)             (min … max)       p75       p99      p999
------------------------------------------------------------ -----------------------------
• small (length 512)
------------------------------------------------------------ -----------------------------
Response#arrayBuffer  32'459 ns/iter  (9'500 ns … 13'394 µs) 35'000 ns    167 µs    550 µs
Response#text         12'947 ns/iter     (9'100 ns … 567 µs) 13'400 ns 35'100 ns    258 µs

summary for small (length 512)
  Response#text
   2.51x faster than Response#arrayBuffer

• middle (length 8192)
------------------------------------------------------------ -----------------------------
Response#arrayBuffer  28'777 ns/iter  (11'700 ns … 2'818 µs) 24'500 ns    118 µs    326 µs
Response#text         23'271 ns/iter    (11'800 ns … 724 µs) 19'300 ns 99'300 ns    258 µs

summary for middle (length 8192)
  Response#text
   1.24x faster than Response#arrayBuffer

• long (length 131072)
------------------------------------------------------------ -----------------------------
Response#arrayBuffer     300 µs/iter  (53'700 ns … 3'534 µs)    280 µs  1'559 µs  3'187 µs
Response#text            322 µs/iter     (120 µs … 3'235 µs)    299 µs  2'027 µs  3'152 µs

summary for long (length 131072)
  Response#arrayBuffer
   1.07x faster than Response#text

• this patch

benchmark                 time (avg)             (min … max)       p75       p99      p999
------------------------------------------------------------ -----------------------------
• small (length 512)
------------------------------------------------------------ -----------------------------
Response#arrayBuffer  20'018 ns/iter   (9'500 ns … 4'492 µs) 15'800 ns    102 µs    415 µs
Response#text         13'385 ns/iter    (10'100 ns … 478 µs) 13'200 ns 38'900 ns    214 µs

summary for small (length 512)
  Response#text
   1.5x faster than Response#arrayBuffer

• middle (length 8192)
------------------------------------------------------------ -----------------------------
Response#arrayBuffer  22'374 ns/iter  (10'900 ns … 2'683 µs) 18'800 ns 97'200 ns    335 µs
Response#text         22'599 ns/iter    (12'200 ns … 487 µs) 21'500 ns 97'700 ns    284 µs

summary for middle (length 8192)
  Response#arrayBuffer
   1.01x faster than Response#text

• long (length 131072)
------------------------------------------------------------ -----------------------------
Response#arrayBuffer     216 µs/iter  (38'100 ns … 3'201 µs)    200 µs    984 µs  2'929 µs
Response#text            314 µs/iter     (119 µs … 3'251 µs)    290 µs  2'046 µs  3'122 µs

summary for long (length 131072)
  Response#arrayBuffer
   1.46x faster than Response#text

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.06%. Comparing base (7a94682) to head (54fa2b2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3109   +/-   ##
=======================================
  Coverage   94.06%   94.06%           
=======================================
  Files          89       89           
  Lines       24327    24331    +4     
=======================================
+ Hits        22883    22887    +4     
  Misses       1444     1444           

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[Uzlopak]

LGTM, but I prefer one or two more approvals.

[mcollina]

lgtm

[tsctx]

Suppressed by #3117