When the parsed value is outside the representable range, such as on input "1e-10000" and "1e+10000", it seems fast_float::from_chars sets the 'value' output parameter to 0 and infinity respectively and returns std::errc{}.

But the specification for std::from_chars (http://eel.is/c++draft/charconv.from.chars#1) says:

If the parsed value is not in the range representable by the type of value, value is unmodified and the member ec of the return value is equal to errc​::​result_­out_­of_­range.

It this deviation from the C++ standard intended?

When integrating fast_float into libstdc++, we adjusted this behavior with the following patch: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=40b0d4472a2591cf27f3a81aa3fba57dc4532648