Permit parsing of incomplete `infinity` but do not return true

To clarify, `parse_f64` will indeed take `infi` to mean `+Inf` and
return that as the value, but it will not return `ok = true`. It treats
it as `inf` followed by any other trailing character.

`parse_f64_prefix` is the lenient one which will return true so long as
it finds some meaningful value.

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