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* Allow keyPrefix to accept an additional argument for double maps * Make key creators accept an optional parameter for key construction * Remove .only from a test case Co-authored-by: Xiliang Chen <xlchen1291@gmail.com> * Cache prefix key when no arguments are supplied * Address review comments * Update packages/metadata/src/Decorated/storage/fromMetadata/createFunction.spec.ts Co-authored-by: Xiliang Chen <xlchen1291@gmail.com> Co-authored-by: Jaco Greeff <jacogr@gmail.com>