Tighten ISO parsing of month and day values

[facugaich]

Per the spec:

 DateMonth :
      0 NonzeroDigit
      10
      11
      12

 DateDay :
      0 NonzeroDigit
      1 Digit
      2 Digit
      30
      31

The following will now throw RangeError

Temporal.Instant.from("1976-40-18T00:00:00Z");
Temporal.Instant.from("1976-11-50T00:00:00Z");
Temporal.PlainDateTime.from("1976-40-18T00:00:00");
Temporal.PlainDateTime.from("1976-11-50T00:00:00");
etc

Note that yearmonth and monthday were changed for consistency but Temporal.PlainYearMonth.from and Temporal.PlainMonthDay.from already validate these values at a higher level

[ptomato]

Thanks, this is correct!

Do take note that this polyfill code is now deprecated and only used to validate the test262 tests, so this change will never be released; additionally we are in the process of converting test files such as regex.mjs to test262 tests.

So do also consider checking with whatever implementation or polyfill you are using whether they handle this correctly.

[codecov]

Codecov Report

Merging #1836 (b2f82c8) into main (8b90758) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1836   +/-   ##
=======================================
  Coverage   94.79%   94.79%           
=======================================
  Files          19       19           
  Lines       10963    10967    +4     
  Branches     1713     1713           
=======================================
+ Hits        10392    10396    +4     
  Misses        556      556           
  Partials       15       15           

Flag	Coverage Δ
test262	81.18% <100.00%> (+<0.01%)	⬆️
tests	89.54% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
polyfill/lib/regex.mjs	100.00% <100.00%> (ø)

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[facugaich]

So do also consider checking with whatever implementation or polyfill you are using whether they handle this correctly.

Thanks for reviewing and merging, I'll look into doing that!