>IsBase64 is an imposibility, aside from unencoding it and checking the
>validity of the result. Base64 encoding intentionally results in primitive
>data (a string) so it can be used wherever primitive data can go
>(particularly emails). The price for that benefit is that you have to do a
>little extra bookkeeping to track whether stuff is encoded or not.
>
>Cheers,
>barneyb
>
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