Protect Packing.pack and Packing.replace against values that include dirty bits

[Amxx]

• If any of the argument of pack contains dirty bits, this could affect the packing.
• Same for replace: if the new value has dirty bits, that may touch the part that is not supposed to be modified.

For extract and replace, the self argument is assumed to be clean (which would be the case if it was produced by pack. Also if it is not clean, the dirty part is preserved by replace, and not extractable by extract (bound check)

[changeset-bot]

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