Stubs and generated arginfo: remove tentative returns from final methods #16213
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A tentative return type is used to allow userland code that overrides a method to not include a typehint without a fatal error; this is inapplicable to final methods (including all methods of final classes), which cannot be overridden. Remove the tentative return declarations, and update the build script to complain about future additions.
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Extension: reflection
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A tentative return type is used to allow userland code that overrides a method to not include a typehint without a fatal error; this is inapplicable to final methods (including all methods of final classes), which cannot be overridden. Remove the tentative return declarations, and update the build script to complain about future additions.