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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`\u003ccharconv>`: `from_chars()` incorrectly tiebreaks `float`s","articleBody":"Reported as DevCom-1592387 by Christopher Dannemiller:\r\n\r\n> When values are converted from string to a floating-point at the exact rounding boundary, the resulting values in the compiler and `std::from_chars` are incorrect. Since there are a large number of values, ~8million on the positive side, that have this problem, I have only included one example:\r\n\r\n> **`131071.98828125f`**, this should result in the floating-point value `0x47fffffe` stored in hex. However, MSVC v19.29 gives `0x47ffffff`. This can be explored using the following Godbolt link https://godbolt.org/z/r7Ks9GMEb. MSVC v19.28 and earlier, along with GCC and Clang, provide the correct results. This indicates that this is a regression in the compiler.\r\n\r\nAlso tracked by VSO-1441452 / AB#1441452 . We'll need to inform the UCRT and compiler when we have a fix.","author":{"url":"https://github.com/StephanTLavavej","@type":"Person","name":"StephanTLavavej"},"datePublished":"2021-11-30T04:17:54Z","url":"https://github.com/microsoft/STL/issues/2363"}