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Add backwards-compat metadata so booleans keep working right

Description

Add backwards-compat metadata so booleans keep working right

In preparation for I7b37295e8862b188d1f3b0cd07f66ac34629678f

Without this, there is at least one user-facing issue, T86852,
but probably more, with that core patch checked out.

This is the approach Anomie recommended.

Bug: T86852
Change-Id: Ief36f80d55d76211839786f7e60aad20ad10c98b