Add freeze() builtin for deep immutability (#78)#480
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freeze(x) recursively converts Arrays to ImmutableArrays and Maps to ImmutableMaps. Already-immutable values with no mutable children are returned as the same pointer (zero allocation). A memo table prevents infinite recursion on self-referential structures. Primitives, strings, bytes, functions and errors pass through unchanged. Closes the planned item from docs/freeze-builtin.md.
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freeze(x) recursively converts Arrays to ImmutableArrays and Maps to ImmutableMaps. Already-immutable values with no mutable children are returned as the same pointer (zero allocation). A memo table prevents infinite recursion on self-referential structures.
Primitives, strings, bytes, functions and errors pass through unchanged.
Closes the planned item from docs/freeze-builtin.md.