unknown: fatal: byte_mask: unknown mask bit in mask: 0x10
0 -> 0x1 -> 0
0x2 -> 1
1 -> 0x2 -> 1
0x4 -> 2
2 -> 0x4 -> 2
0x8 -> 3
unknown: fatal: byte_mask: unknown mask bit in mask: 0x10
unknown: fatal: unknown name value "4" in "1234"
unknown: fatal: unknown name value "a" in "abcd"