Skip whitespace characters between pairs of hex numbers. This makes `bytes.fromhex()` compatible with cpython. Includes simple test in `tests/basic/builtin_str_hex.py`. Signed-off-by: Glenn Moloney <glenn.moloney@gmail.com>
Because bytes.hex() only supports the sep argument since Python 3.8. Signed-off-by: Damien George <damien@micropython.org>