EXPANSION-LEVEL-WEIGHT-A : INFOEXPANSION-LEVEL-WEIGHT-A is a flag setting or other piece of information.
A setting for the flag WEIGHT-A-FN.
Returns the expansion level of the option to be used as a weight.
The expansion level is (roughly) the number of times that NAME-PRIM
had to be called in order to generate this option -- usually 1.
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