New in version 1.1.
Change duration_token to duration pair:
abjad> from abjad.tools import durationtools
abjad> durationtools.duration_token_to_duration_pair(Fraction(2, 4))
(1, 2)
New in version 2.0: Change LilyPond duration string to duration pair:
abjad> durationtools.duration_token_to_duration_pair('8.')
(3, 16)
Return pair.
Changed in version 2.0: renamed durationtools.token_unpack() to durationtools.duration_token_to_duration_pair().