Changelog

0.1.0

Initial release.

Equality of intervals is now more correct (is an equivalence relation), and their hash is now no finer than the equality.
Added interval, a simple way to make intervals from strings like 700c, 7/5, 1.618 or 12\19. Also, interval(7, 5) = interval('7/5').
Infinite or NaN ratios are not allowed anymore, who’d thought that!
You can now match just Monzo(seq) instead of Monzo(entries=seq). Intervals don’t obtain that, as usually you’d want to extract either a ratio or a value in cents, and named arguments thus are the way to go.
Now the more exact of cents or ratio is used in applying to a frequency, so you can have interval('1\17') * 17 + 440 = 880 exactly.
Monzo.entry_at_prime(p) is a comfortable way to get an entry instead of guessing prime indices.
Minor tweaks and typo corrections.
Still no proper unit tests.

Interval initializer now allows specifying just one of cents or ratio, and when both are present, uses the more exact one (like cents=700 or ratio=Fraction(7, 5) vs. floating-point values) to recalculate the other.
Thus, a breaking change: from_cents and from_ratio are no more.
A new formatting specificator for intervals: p for outputting strings parsable by interval and less noisy than the default str.
Binary minus may be used now: i1 - i2 = i1 + (-i2) = i1.stack(i2.inverse).
Interval.stretch_from and / accompany multiply and * now. For completeness, there’s also // which uses the already existing divmod.
Intervals also now support abs.
A new shorthand Interval.approximate_in_edo to get an approximation and its error in a single line.
Finally, unit tests. And what revelations have they brought!
JISubgroup got more usable: now you can test for subgroup containment or isomorphism of two groups.
Typos (and off-by-1 errors, ugh) as always.

Factored out typing annotations which clients may find useful into xenterval.typing from an internal module.
New interval representation as a product of prime powers, borrowed from https://github.com/m-yac/microtonal-utils. Now not only intervals from edos can be manipulated without loss of precision, but also intervals from other edXs with rational periods.
Disposed with edo attributes, replacing them with edx extended counterparts. The period of an edX there defaults to 2, though.
Monzo is now a bit overreaching, as we now have prime decomposition info in the Interval itself. I’ll investigate refactoring possibilities later.
Successive interval approximations: Interval.ratio_convergents to give ratios and Interval.edx_convergents to give steps\division fractions for the given period.