New in version 2.0.
Set denominator of tuplets in expr to at least n:
abjad> tuplet = Tuplet(Fraction(3, 5), "c'4 d'8 e'8 f'4 g'2")
abjad> f(tuplet)
\fraction \times 3/5 {
c'4
d'8
e'8
f'4
g'2
}
abjad> tuplettools.set_denominator_of_tuplets_in_expr_to_at_least(tuplet, 8)
abjad> f(tuplet)
\fraction \times 6/10 {
c'4
d'8
e'8
f'4
g'2
}
Return none.