I don't understand how that works.
Muslims?
to allow couples with just one spouse
I don’t understand how that works.
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“...just one spouse from a one-child family...”. The current exception is that two children can be had by a marriage in which BOTH spouses come from a single child family. The rumored (and later denied) change being considered would have allowed two children if ONLY ONE of the two spouses came from a single child family.
Up thread someone mentioned Muslims. Currently ethnic minorities (i.e., non-Han Chinese) are not subject to the single child limit. That is short sighted and will likely come back to bite the Chinese in the long term.