JuliaLang/julia — comment on commit c433f9dd035cb9286921e911ec8c8095f3bfd17e
File: j/table.j line 62
By JeffBezanson:

Becuase of what I said in the comment. When abs(x)==float64(typemax(Uint64)), it actually equals 2^64 and cannot be represented by a Uint64. (2^64 is the closest representable float to typemax(Uint64))