@eagleoutice/flowr - v2.15.8
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    S4GroupOfMember: ReadonlyMap<string, string> = ...

    Member name to its S4 group (sin to Math, + to Arith). Ops is left out so + answers Arith rather than both. A package exporting such a name usually does so because it registered a method for one of its classes, so the name says far less about the package than an ordinary export would.