Fix C4242 warning in serial_port_base::character_size::store #460
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Add static_cast<BYTE> to avoid MSVC warning C4242 when converting from unsigned int to BYTE in character_size::store(). This warning causes issues for projects that treat warnings as errors. The cast is safe since character_size values are always in the valid BYTE range (typically 5, 6, 7, or 8). Fixes boostorg#392
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This fixes #392 where MSVC was throwing a C4242 warning about converting from unsigned int to BYTE.
I hit this issue when compiling with /WX (treat warnings as errors). The warning happens because value_ is unsigned int but storage.ByteSize expects a BYTE.
The fix is simple - just add a static_cast. The cast is safe since character_size values are always in the valid range (5, 6, 7, or 8 bits).
Tested that this compiles cleanly on MSVC 2019 with /W4.