Ensure that implementation-defined Intl operations access properties …

[cjtenny]

…in consistent order and only call getters once.

Fixes #1388.

[codecov]

Codecov Report

Merging #1430 (c584506) into main (97b882c) will decrease coverage by 46.69%.
The diff coverage is 32.60%.

@@             Coverage Diff             @@
##             main    #1430       +/-   ##
===========================================
- Coverage   95.73%   49.04%   -46.70%     
===========================================
  Files          19       18        -1     
  Lines       11143     4961     -6182     
  Branches     1804     1082      -722     
===========================================
- Hits        10668     2433     -8235     
- Misses        472     2118     +1646     
- Partials        3      410      +407     

Flag	Coverage Δ
test262	49.04% <32.60%> (+0.02%)	⬆️
tests	?

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

Impacted Files	Coverage Δ
polyfill/lib/calendar.mjs	17.11% <30.43%> (-77.06%)	⬇️
polyfill/lib/ecmascript.mjs	54.64% <31.81%> (-41.50%)	⬇️
polyfill/lib/timezone.mjs	65.51% <100.00%> (-28.24%)	⬇️
polyfill/lib/zoneddatetime.mjs	42.56% <0.00%> (-55.37%)	⬇️
polyfill/lib/plaindate.mjs	49.38% <0.00%> (-46.66%)	⬇️
polyfill/lib/duration.mjs	53.36% <0.00%> (-44.94%)	⬇️
polyfill/lib/plaintime.mjs	55.12% <0.00%> (-41.50%)	⬇️
polyfill/lib/plaindatetime.mjs	54.31% <0.00%> (-41.20%)	⬇️
... and 10 more

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[ptomato]

Thanks, all looks correct.