Any clue about python3-typed-ast migration?

[Michael Crusoe <michael.crusoe@gmail.com>]

python3-mypy 0.670-2 in testing has a dependency on python3-typed-ast (<< 1.4.0)

But autopkgtests is combining python3-typed-ast 1.4.0-1 with python3-mypy 0.670-2 and predictably that fails :-(

https://qa.debian.org/excuses.php?package=python3-typed-ast

Is the "<<" comparator inclusive or exclusive of the right-hand-side number?

https://www.debian.org/doc/debian-policy/ch-relationships.html#syntax-of-relationship-fields defines << as "strictly earlier" so I don't see the error here.

I can add a "breaks" between python3-typed-ast 1.4.0 and python3-mypy less than 0.720; but that seems technically unnecessary..

Thanks,

-- 
Michael R. Crusoe