New in version 2.0.
True expr is a sequence and when all elements in expr are nonnegative integer-equivalent numbers. Otherwise false:
abjad> from abjad.tools import sequencetools
abjad> sequencetools.all_are_nonnegative_integer_equivalent_numbers([0, 0.0, Fraction(0), 2, 2.0, Fraction(2)])
True
Return boolean.