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Copy-On-Write string data-type provides an implementation of mutable strings sothat creating and copying them is free, performance wise. The object's internalmemory is reference counted and shared among instances. Thus it only make acopy for a specific instance, when it's data is modified. It is based onnim-lang/RFCs#221. It shouldimprove performance when strings are frequently copied. Passing a string to athread triggers a deep copy, so it is compatible with multi-threading.