copy - recursively duplicate a value

mixed copy(mixed);

copy() returns a value with exactly the same value as its argument, but with all reference types (mappings, arrays, etc) duplicated. For example:

mapping a, b = ({ 1 }); a = b; a[0] = 2; printf("%O %O\n", a, b);

results in ({ 2 }) and ({ 2 }), while:

mapping a, b = ({ 1 }); a = copy(b); a[0] = 2; printf("%O %O\n", a, b);

results in ({ 2 }) and ({ 1 }).