For the purposes of layers, is doubling a unit's might counted as assignment or arithmetic?

Ruling: Doubling a unit's might is counted as arithmetic, not assignment.

Nuances:

• Assignment would require language like "a unit's might becomes double its current might" using words like "becomes" or "is"
• Without "becomes" or "is", doubling should be treated as arithmetic (essentially "give a unit +X Might where X is its current might")
• When both a doubling effect and a flat bonus (like +2) apply with the same timestamp, the doubling effect depends on the flat bonus, so the flat bonus is applied first, then the doubling