from_chars() mixed its int digit and base into the arithmetic of an
unsigned T, a sign conversion since Content-Length is parsed as size_t.
Convert both to T first.
Comparing a uint64_t with SIZE_MAX is always false on 64-bit builds,
so the WebSocket frame length and mmap size checks tripped
-Wtautological-type-limit-compare. fits_in_size_t() checks with a
round trip instead, and the Windows branch of mmap::open() uses it too.
The raw ::send() calls in the WebSocket tests passed an int length,
which POSIX takes as size_t. Use detail::send_socket(), which handles
both.
yhirose
062666f3a1
