Fully Implementing PSR-16 Simple Cache is Less Than Simple

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Foreword : Please note this falls firmly into "nitpick" territory rather than shining light onto any sort of major issue. I just thought it was an interesting gotcha and wanted to share. TL;DR : To fully implement the PSR-16 specification as defined, an implementation MUST be contravariant of the defined interface in its accepted parameters when implementing v2 or later. I work on an application…

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