Revert "fix casing issue when cloning Headers object (#3160)"

[tsctx]

Refs: #3160 (comment)

[KhafraDev]

This should be easily fixable by fixing .entries

undici/lib/web/fetch/headers.js

Line 250 in 034e3f0

get entries () {

?

[tsctx]

It's impossible because it's an object. It must be an array.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.13%. Comparing base (034e3f0) to head (1d49f97).
⚠️ Report is 983 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #3161       +/-   ##
=========================================
+ Coverage      0   94.13%   +94.13%     
=========================================
  Files         0       90       +90     
  Lines         0    24309    +24309     
=========================================
+ Hits          0    22883    +22883     
- Misses        0     1426     +1426     

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[KhafraDev]

We could probably use kHeadersSortedMap (how the iterators run) instead. The webidl part can return an array too.

[KhafraDev]

I'll take a look at it in a few hours, fixing it from my point of view doesn't seem too difficult.

[tsctx]

This seems not the best solution.