Lookup decoder checks for `flag == 6` when flag is a `Bit`

[perlinm]

I'm not sure what exactly is going on, but I do not think this makes sense to do. See this code block (first line says that flag: Bit, last line checks for flag == 6).

[perlinm]

I think this is just a typing error, fixed in #115

[perlinm]

fixed in #115