feat(assert): support callback for message #36
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A callback may be passed to `assert`'s second arg instead of a string. The callback must return a string. This is useful in when the message is expensive to create. With the callback message, we can defer the potentially costly message creation until it is actually needed. Closes garronej#34
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A callback may be passed to
assert's second arg instead of a string. The callback must return a string.This is useful in when the message is expensive to create. With the callback message, we can defer the potentially costly message creation until it is actually needed.
Closes #34