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Implicit can make things hard to understand meaning it should be used with caution.

But allowing CustomInt i = 0; instead of CustomInt i = CustomInt::Zero; or worse CustomInt i = static_cast<CustomInt>(i); isn't a bad thing.

Can’t you do `auto i = CustomInt(0)`? Then all of the construction is explicit (and in a single place in the statement) without repeating.

For me this looks fine:

var i = CustomInt.valueOf(0)