* adding some basic tests
* min error
* fix min
* fix saturating_take
* all fungible and non fungible
* min abstract
* fix saturating take
* clean up
* some comments and fixes
* another fix
* more fixes
* comment
* remove unnecessary collect
* improve iter cloning
* better saturating_take impl
* feedback
* fix no_std build
* add doc tests
* mem::replace to be a bit more efficient
* better api