Unexpected trailing zeros in to_string(double)

[alabuzhev]

std::cout << fmt::to_string(1234.0);

Previously (for years) this was printing "1234".
Now it prints "1234.0" and, of course, breaks someone's workflow.

Probably related to #1129.

[vitaut]

Thanks for reporting. The default has changed to the shortest decimal representation to follow the standards proposal, so this is expected. If you want some specific format please use the fmt::format function instead.

[alabuzhev]

Ok, thanks.
And what the format string should be used then please?
#1129 mentions ":g", but fmt::format("{0:g}", 1234.0) gives "1234.", i.e. with the decimal point character.

[alabuzhev]

P.S.
Python: "{0:.16g}".format(1234.0) -> 1234
C: printf("%.16g", 1234.0); -> 1234

[vitaut]

g is a correct option and trailing . there is a bug.