Add `ExistenceRequirement` to `Currency` trait (#4000)
* Added a public transfer_some function and a private transfer_inner fn * Move transfer_some to the end of the module impl to fix failing contracts test * Change whitespace * Remove needless change to transfer logic * Fix error * Update srml/balances/src/lib.rs Co-Authored-By: joe petrowski <[email protected]> * Improve documentation and add test * Update srml/balances/src/lib.rs Co-Authored-By: Kian Paimani <[email protected]> * Switch to changing Currency trait instead
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