pass unsupported boxes verbatim without breaking them

[sevenrats]

If taglib encounters boxes it doesn't understand, it can sometimes munge their bytes. for example if it encounters a nero version 1 box, it will munge it so the bytes read v0. if its run again on that same file it either fails or munges the value to 6 (not even real)

fixes #373 #376

this fix allows us to pass opaque boxes verbatim so they are not corrupted.

[sevenrats]

@dotnet-policy-service agree Mar 30, 2026, 14:44 by ***@***.***:

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