Bugfix: Restore support for custom input, alongside text and TextSlice

[erezsh]

Fixes issue #1560

[MegaIng]

Excluding those two minor style changes, this looks good.

Sorry, I also forgot about this usecase when reviewing the original change set.

[MegaIng]

I would write this as LarkInput = Union[TextOrSlice, Any] to make it clearer what the logic here is. Functionally they are equivalent.

[erezsh]

I guess Any overrides any other type in the union, but I want there to be an explicit list of the types that could be accepted in the normal case.

[MegaIng]

IMO the explicit lists is also just above the line anyway, but sure, if you want to keep it like this that's fine.

(And yes, from a type-checking perspective having Any in there removes all checks - to fix this we would need essentially depended types which don't (yet) exists in python's typing system)

[erezsh]

I have a mild preference to keeping it this way.

If we really cared about typing, we could have a different function like parse_custom(). But I'm not sure if it's worth the trouble.

[MegaIng]

It's not IMO and still a breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 97.91667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.97%. Comparing base (e332c2d) to head (7c365de).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
lark/lexer.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1562      +/-   ##
==========================================
+ Coverage   89.93%   89.97%   +0.03%     
==========================================
  Files          52       52              
  Lines        7987     8018      +31     
==========================================
+ Hits         7183     7214      +31     
  Misses        804      804              

Flag	Coverage Δ
unittests	89.97% <97.91%> (+0.03%)	⬆️

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