Claude Warren commented on LANG-1387:

This does not seem to fit in any of the existing commons-numbers categories.  
Are you suggesting a new category?  If so what would the category for span 
would be? 

Numbers appears to be categories of numbers (e.g. primes, complex, etc.)  I 
don't think this fits.



> Add Span interfaces to handle checks for overlaps, containment, equality, etc.
> ------------------------------------------------------------------------------
>                 Key: LANG-1387
>                 URL: https://issues.apache.org/jira/browse/LANG-1387
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.*, lang.math.*
>    Affects Versions: 3.7
>            Reporter: Claude Warren
>            Priority: Minor
> This is a contribution of a span class as discussed on the mailing list.
> The classes are int and long based and can:
>  # determine if points are within the span.
>  # determine if one span contains another span
>  # determine if two spans overlap
>  # do not have to have 0 (zero) as the index origin.
>  # determine the length of the span
>  # determine the last position in the span.
>  # determine the first position in the span.
> Changes to Number Utils required to detect underflow and overflow 
> calculations.

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