Drop the integer argument to MonthDay.toDateInYear and rename.

[Ms2ger]

See #889.

[codecov]

Codecov Report

Merging #1106 into main will decrease coverage by 3.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1106      +/-   ##
==========================================
- Coverage   93.55%   90.24%   -3.31%     
==========================================
  Files          19       17       -2     
  Lines        7961     8235     +274     
  Branches     1264     1186      -78     
==========================================
- Hits         7448     7432      -16     
- Misses        506      793     +287     
- Partials        7       10       +3     

Flag	Coverage Δ
test262	?
tests	90.24% <ø> (+0.81%)	⬆️

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

Impacted Files	Coverage Δ
polyfill/lib/intrinsicclass.mjs
polyfill/lib/shim.mjs
polyfill/lib/now.mjs
polyfill/lib/temporal.mjs
polyfill/lib/slots.mjs
polyfill/lib/regex.mjs
polyfill/lib/legacydate.mjs
polyfill/lib/intl.mjs
lib/datetime.mjs	91.02% <0.00%> (ø)
lib/timezone.mjs	89.91% <0.00%> (ø)
... and 15 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a368ad3...4468dd6. Read the comment docs.