vault-0.3.1.5: a persistent store for values of arbitrary types

vault-0.3.1.5: a persistent store for values of arbitrary types

A vault is a persistent store for values of arbitrary types. It's like having first-class access to the storage space behind IORefs.

The data structure is analogous to a bank vault, where you can access different bank boxes with different keys; hence the name.

Also provided is a locker type, representing a store for a single element.

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