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-rw-r--r--spec/reference.bqn6
1 files changed, 4 insertions, 2 deletions
diff --git a/spec/reference.bqn b/spec/reference.bqn
index 8d872dad..d3f84ec9 100644
--- a/spec/reference.bqn
+++ b/spec/reference.bqn
@@ -377,7 +377,9 @@ Replicate ← {0<=𝕨}◶(⥊˜⟜≠Rep⊢)‿{!𝕨=○≠𝕩⋄𝕨Rep𝕩}
{ Identity ↩ 𝕨˙⊸=◶Identity‿𝕩 }´¨ ⟨ ∨‿0 , ∧‿1 ⟩
-Join←(0<=)◶{!IsArray𝕩⋄>𝕩}‿{
+JoinEmpty ← ({!𝕨≤○≠𝕩⋄𝕨≠⊸((𝕨×≠⊸↑)∾↓)𝕩}○≢⥊⊢)⟜Fill
+
+Join←(0<≠∘⥊)◶⟨JoinEmpty, (0<=)◶{!IsArray𝕩⋄>𝕩}‿{
! IsArray 𝕩
s←≢¨𝕩
a←(≢𝕩){(s⊑˜(j=𝕩)⊸×)¨↕𝕨}¨j←↕r←=𝕩
@@ -389,7 +391,7 @@ Join←(0<=)◶{!IsArray𝕩⋄>𝕩}‿{
! s≡(<t)∾⌜´h⥊¨¨l
i←(<⟨⟩)∾⌜´h{((↕¯1⊸⊑)-𝕩/𝕨⥊¨»)+`𝕩}¨l
>i<¨⊸⊏⍟(0<≠∘⊣)¨l/𝕩
-}⍟(0<≠∘⥊)
+}⟩
Group←{
! IsArray 𝕩