New in version 2.0.
True when expr is a sequence and all elements in expr are integer-equivalent numbers:
abjad> from abjad.tools import sequencetools
abjad> sequencetools.all_are_integer_equivalent_numbers([1, 2, 3.0, Fraction(4, 1)])
True
Otherwise false:
abjad> sequencetools.all_are_integer_equivalent_numbers([1, 2, 3.5, 4])
False
Return boolean.