Improve return both cast errors and validation error for valid casted data

[bluzky]

close #20

[coveralls]

Pull Request Test Coverage Report for Build 5e0bde0494b61dda5add7bdfe9f729666abd64e3-PR-22

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 90.698%

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Totals
Change from base Build 545370d8decb315b76623a5cb7f01f18da40d4ce:	0.2%
Covered Lines:	156
Relevant Lines:	172

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💛 - Coveralls