Deprecate convert for closed intervals in favor of only

[p-zubieta]

Another take on #144 as suggested in #143. I don't know if this is the best name for this function nor how the presence of the deprecation affects removing the method. But throwing the idea here anyway to keep the ball rolling.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.93%. Comparing base (e04f9d4) to head (9167160).
⚠️ Report is 72 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage   81.73%   81.93%   +0.20%     
==========================================
  Files          11       11              
  Lines         624      631       +7     
==========================================
+ Hits          510      517       +7     
  Misses        114      114              

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[p-zubieta]

@omus was something like this what you had in mind here?

[nalimilan]

Maybe making this a method of only would make sense?

[KristofferC]

Bump, I'm seeing thousands of invalidations less with this PR (for a big package I am looking at).

The next big one is

Intervals.jl/src/endpoint.jl

Lines 148 to 149 in 8474023

	Base.:(==)(a, b::Endpoint) = a == b.endpoint && isclosed(b)
	Base.:(==)(a::Endpoint, b) = b == a

givinb 2.6k invalidations.

[p-zubieta]

For the latter there is #143.

[omus]

@omus was something like this what you had in mind here?

Yes, this is. I was thinking of using an alternative function name like scalar but only seems quite reasonable

[omus]

With a few changes and a rebase to get the CI working I think we can get this merged

[p-zubieta]

The failing tests are unrelated, but I' not sure about the docs failure.

[omus]

Only some minor things left here