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The strtold fallback, which is left only for long double formats that are not binary64 (x87, binary128), substituted the first byte of the locale's decimal point for '.'. Under a locale whose decimal point is longer than one byte, such as fa_IR.UTF-8 or ar_EG.UTF-8 (U+066B), strtold stopped there and the value was truncated at the decimal point. A longer decimal point is now put into a copy of the token. The test "locale with a multi-byte decimal point" now compares the long double values with those of the "C" locale; with x87 long doubles it failed before. Fixes #5660. Signed-off-by: Niels Lohmann <mail@nlohmann.me>