feat: deprecate Val

[nstarman]

I noticed in the code that the requirements to begin the deprecation process were fulfilled.

[coveralls]

Pull Request Test Coverage Report for Build 9706563998

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.92%

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Totals
Change from base Build 9692435229:	0.0%
Covered Lines:	1252
Relevant Lines:	1253

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9707369488

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.92%

---

Totals
Change from base Build 9692435229:	0.0%
Covered Lines:	1252
Relevant Lines:	1253

---

💛 - Coveralls

[wesselb]

@nstarman You're totally right! :) This looks great!! Let me know when the PR is ready for review.

@PhilipVinc, I believe you used Val in some places in the past. Do you also think Val can be deprecated, or is there still an edge case where Literal cannot replace Val?

[PhilipVinc]

We stopped using them long ago in favour of Literal.

[wesselb]

@PhilipVinc Thanks! Lets merge this then whenever @nstarman thinks its ready. :)