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mutable x -- returns true or false, depending on whether x is mutable.

If x is a hash table, list, or database, then it's mutable if its contents can be destructively altered.

If x is a symbol, then it's mutable if a value can be assigned to it. (See protect.)

If x is anything else, then it isn't mutable.

The contents of a mutable hash table do not participate in strong comparison with === or in hashing.

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