[CLN] Remove TypeError in Interval.length

[makbigc]

Following #25768, remove TypeError in Interval.length, as all endpoints should be comparable now.

[codecov]

Codecov Report

Merging #25859 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25859   +/-   ##
=======================================
  Coverage   91.45%   91.45%           
=======================================
  Files         172      172           
  Lines       52892    52892           
=======================================
  Hits        48373    48373           
  Misses       4519     4519

Flag	Coverage Δ
#multiple	90.02% <ø> (ø)	⬆️
#single	41.81% <ø> (ø)	⬆️

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[codecov]

Codecov Report

Merging #25859 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25859   +/-   ##
=======================================
  Coverage   91.45%   91.45%           
=======================================
  Files         172      172           
  Lines       52892    52892           
=======================================
  Hits        48373    48373           
  Misses       4519     4519

Flag	Coverage Δ
#multiple	90.02% <ø> (ø)	⬆️
#single	41.81% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6e0f9a9...0198873. Read the comment docs.

[jreback]

why do no tests break? or they were removed in the prior PR?

[jschendel]

or they were removed in the prior PR?

Yeah, the test cases for this were removed in #25768, as they were disallowed at the constructor level. The test introduced in #25768 converted the existing failing test cases for Interval.length into failing test cases for the constructor.

[jschendel]

thanks @makbigc