Remove generics from Mapper.Builder #63623
Merged
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We simplified the generics on Mapper.Builder in #56747, but stopped short
of removing them entirely because they were still used in various places in
the code. Now that most field mappers have been converted to parametrized
form, these generics are no longer useful. There are very few places where
a fluent Builder pattern is used, almost all in tests, and these can all be
replaced with simple casts; in exchange, we remove lots of visual cruft and
clean up a number of warnings.