Meta.EqualCustom equality key.
The Fun.Generic.equal function consults this key in the metadata of a gist g before determining equality between values described by the gist. If a function is found, the values are compared with this function instead.
This can also be used to indicate that you would not like to compare a subtructure by always returning true, the Equal.ignore function does that.
type 'a meta := 'a Type.Gist.Meta.tval mem : 'a meta -> boolmem m is true iff m has a binding for the key.