[Intl] make polyfill classes abstract, fix edge case #33275
Merged
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While working on return types, I keep stumbling on those classes that are
@internal
, but for which we must not add return types, because they're polyfills and are extended by stubs found in theResources
folder of the component.Making the polyfills abstract fixes the linting issue.
This made me discover we have a glitch in the
getPattern()
implementation, that makes our version diverge from intl's. Fixed here too.On 4.4 because let's not disrupt 3.4.