[MTN] more permissive check_backend #494
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rflamary
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With the current behavior, the
check_backendhelper fails when one of the arguments is a subtype of the base type of the backend. For instance, if one argument is amemmap, while it is still andarray, thecheck_backendraises aValueError.This PR makes the helper check the type of all arguments with
isinstance. It also refactors the API to ease the backend management.