object-shape-tester - v5.1.6
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    Variable isShapeSpecifierKeyConst

    isShapeSpecifierKey: "__vir__shape__specifier__key__do__not__use__in__actual__objects" = '__vir__shape__specifier__key__do__not__use__in__actual__objects'

    A special key string which is used to tag ShapeSpecifier instances so that we know they're shape shape specifiers instead of part of the shape itself.

    This should be a symbol, but TypeScript errors out about "using names that cannot be named" in that case.