Issue 4120 added an implicit cast for BigInt to a boolean value.
This used to work: /// Returns a mutable copy of a BigInt public BigInt mutable(const BigInt num) { BigInt big = cast(BigInt)num; return big; } But it now generates an error:Error: template instance opCast!(BigInt) does not match template declaration opCast(T : bool)()
Is there another way to make a mutable copy of a BigInt?