Add duplicate type check to fn insert

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#64 创建于 2019年12月27日 1 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

描述

`fn insert` currently doesn't actually check for duplicate components being inserted for a given entity.

In `debug_assertions`, this causes a already borrowed error. in Release, this causes UB.

we should add a check for this case in the insert iterators to confirm we arn't causing this.

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