make many extend into other collections that Vec

[Geal]

Fix #1409

This will likely remove the optimizatio of preallocating vector capacity, but we can get this back with a wrapper type if needed, and being able to created directly a hashmap or other collections instead of going through a vec first will be way more useful

[coveralls]

Pull Request Test Coverage Report for Build 3943758788

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 8 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 62.104%

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Files with Coverage Reduction	New Missed Lines	%
src/traits.rs	8	62.79%
<!--	Total:	8		-->

Totals
Change from base Build 3924923584:	-0.3%
Covered Lines:	1547
Relevant Lines:	2491

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💛 - Coveralls