The bits of the first byte of a sequence that hold the code point, indexed by the number of continuation bytes that follow (0 to 5).
utf8_inital_byte_mask :: u8.[0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01]The bits of the first byte of a sequence that hold the code point, indexed by the number of continuation bytes that follow (0 to 5).
utf8_inital_byte_mask :: u8.[0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01]