The type(expr, MVIndex) function returns true if expr is an integer, an integer range, or a list whose elements are either integers or ranges of integers.

$\mathrm{type}\left(1\,\mathrm{MVIndex}\right)$

$\mathrm{true}$

$\mathrm{type}\left(4..-1\,\mathrm{MVIndex}\right)$

$\mathrm{true}$

$\mathrm{type}\left(\left[1\,3..5\,7\,8\,10..-1\right]\,\mathrm{MVIndex}\right)$

$\mathrm{true}$