use from_utf8_unchecked in the fmt::Display implementation of Value #751
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Since the serializer only emits valid utf8 by default we can remove the checks that the data being formatted is valid.
WriterFormatter
has been moved into it's own little module to enforce using it'snew
method to convey the unsafe requirements.the safety requirements that the serializer only emits valid utf8 is already assumed by the existing
to_string
methods.Marking
WriterFormatter
as unsafe is not strictly necesarry as it is already contained within the module bounds, but this way it's a bit more explicit about the assumptions being made.this speeds up formatting large
Value
s by about 33% in my testing.