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docs: note std::format vs fmt difference for 'a' format #4784

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docs: note std::format vs fmt difference for 'a' format #4784

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5 changes: 5 additions & 0 deletions doc/api.md
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Expand Up @@ -715,6 +715,11 @@ following differences:
(ignoring redundant digits and sign in exponent) and may produce more
decimal digits than necessary.

- For the `'a'`/`'A'` presentation types, {fmt} includes the `0x`/`0X`
prefix in the output (like `printf`'s `%a`), while `std::format` output
for hexadecimal floating-point values is specified in terms of
`std::to_chars` and does not include that prefix.

## Configuration Options

{fmt} provides configuration via CMake options and preprocessor macros to
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