⍝ Refs path from root to ⍵:

    0⍴'a.b.c' ⎕ns''

    (refpath a.b.c) ≡ (refpath ⎕this), refs a
1
    (,¨# ⎕se) ≡ refpath¨ # ⎕se      ⍝ refpath of root returns 1-vector.
1

⍝∇ refpath refs

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