Function compareRange

Returns how b overlaps with a.

Returns:

• none if b does not overlap with a
• equal if b has the same start and end as a
• full if b is fully contained within a and a does not share a start/end
• full-border if b is fully contained within a and a shares a start/end
• partial if b overlaps with a but is not fully contained within it

compareRange({ start:2, end:4 }, { start:0, end:1 }); // 'none'
compareRange({ start:2, end:4 }, { start: 2, end:4 }); // 'equal'
compareRange({ start:2, end:4 }, { start: 3, end: 3 }); // 'full'
compareRange({ start:2, end:4 }, { start: 3, end: 4 }); // 'full-border'
compareRange({ start:2, end:4 }, { start: 1, end: 3 }); // 'partial'
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