Simple BitSet

A dead simple bitset. Not generic at all, it only stores u8s and nothing else. For its underlying storage it uses a [u64; 4]

Attempts to match the interface of std::collections::HashSet with some exceptions.

HashSet methods not implemented for simple BitSet

• get_or_insert_with: Low priority TODO.
• entry: Medium priority TODO.
• hasher: Won't be implemented. No sane way to implement this.

HashSet methods that are behind the compatibility-methods feature

• capacity: Just returns 256usize.
• reserve: Does nothing.
• shrink_to: Does nothing.
• shrink_to_fit: Does nothing.
• try_reserve: Returns Ok(()).
• with_capacity: Same behavior as new() just returns an empty BitSet.
• with_hasher: Same behavior as new() just returns an empty BitSet. Note that hasher parameter can be any type.
• with_capacity_and_hasher: Same behavior as new() just returns an empty bitset. Note that hasher parameter can be any type.