feat(zval): Zval coercion

[kakserpom]

Rework of #341

[coveralls]

Pull Request Test Coverage Report for Build 21621055676

Details

• 110 of 115 (95.65%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.5%) to 35.786%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/types/zval.rs	110	115	95.65%

Totals
Change from base Build 21601094043:	1.5%
Covered Lines:	2077
Relevant Lines:	5804

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💛 - Coveralls

[ptondereau]

we should keep the same behavior as PHP, so don't hesitate to use internal function

[kakserpom]

@ptondereau

we should keep the same behavior as PHP, so don't hesitate to use internal function

I tried that and it led to some complications across PHP versions. I've decided to stick with Rust. Added more tests.

[ptondereau]

@ptondereau

we should keep the same behavior as PHP, so don't hesitate to use internal function

I tried that and it led to some complications across PHP versions. I've decided to stick with Rust. Added more tests.

ok then it should be documented