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[23:27] <habere-et-disper> R seems to borrow an implicit comma from Z, but doesn't borrow from the infix form. Compare:

[23:27] <habere-et-disper> m: say [RZ] (1,2),(3,4)

[23:28] <habere-et-disper> m: say (1,2) RZ, (3,4)

[23:28] <habere-et-disper> m: say (1,2) RZ (3,4)

[23:28] <habere-et-disper> Is this expected behaviour?

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