Use a limited ↓ for part of the runtime

2 files changed, 13 insertions, 13 deletions

diff --git a/docs/bqn.js b/docs/bqn.js
index 05d2da0f..5a30087d 100644
--- a/docs/bqn.js
+++ b/docs/bqn.js
@@ -244,9 +244,9 @@ let provide = [
 ];
 
 let [runtime,setPrims] = run(
-  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  ,provide.concat([0,1,2,Infinity,-Infinity,32,3,8,-1,5,4,'∾','+','-','×','÷','⋆','¬','⌊','⌈','∨','∧','≠','=','>','≥','˙','√','<','⊢','⊣','≍','↑','↓','↕','⌽','⍉','/','⊔','˜','¨','⌜','˘','`','∘','○','⌾','⍟','⊘','⊸','⟜',str("+-×÷⋆√⌊⌈|¬∧∨<>≠=≤≥≡≢⊣⊢⥊∾≍↑↓↕«»⌽⍉/⍋⍒⊏⊑⊐⊒∊⍷⊔!˙˜˘¨⌜⁼´˝`∘○⊸⟜⌾⊘◶⎉⚇⍟⎊%"),str("´: 𝕩 must be a list"),str("´: Identity not found"),str("Mapping: Equal-rank argument shapes don\'t agree"),str("Mapping: Argument shape prefixes don\'t agree"),str("⍋𝕩: 𝕩 must have rank at least 1"),str("⍋ or ⍒: Rank of 𝕨 must be at least 1"),str("⍋ or ⍒: Rank of 𝕩 must be at least cell rank of 𝕨"),str("⍋ or ⍒: 𝕨 must be sorted"),str("/: Replication argument must have rank 1"),str("/: Amounts to replicate must be natural numbers"),str("⌽𝕩: 𝕩 must have rank at least 1"),str("𝕨⌽𝕩: 𝕨 must consist of integers"),str("↑𝕩: 𝕩 must have rank at least 1"),str("↓𝕩: 𝕩 must have rank at least 1"),str("⊏𝕩: 𝕩 must have rank at least 1"),str("⊏𝕩: 𝕩 cannot have length 0"),str("𝕨⊏𝕩: 𝕨 must be an array"),str("𝕨⊏𝕩: Indices in 𝕨 must be integers"),str("𝕨⊏𝕩: Indices out of range"),str("𝕨⊑𝕩: Index out of range"),str("𝕨⊑𝕩: Indices in 𝕨 must consist of integers"),str("𝕨⊑𝕩: 𝕩 must be a list when 𝕨 is a number"),str("⌾: Incompatible result elements in structural Under"),str(">𝕩: Elements of 𝕩 must have matching shapes"),str("∾𝕩: Elements of 𝕩 must all have the same rank"),str("∾𝕩: 𝕩 element rank must be at least argument rank"),str("∾𝕩: 𝕩 element shapes must be compatible"),str("∾𝕩: 𝕩 element trailing shapes must match"),str("∾𝕩: empty 𝕩 fill rank must be at least argument rank"),str("∾𝕩: 𝕩 must be an array"),str("⊢⊣˜∘○⊸⟜⊘◶"),str("=≠≢"),str("<"),str("≍"),str("↕/»«⊔"),str("⥊↑↓⌽⍉⊏⊑"),str("𝕨"),str("𝕩: 𝕨 must "),str("have rank at most 1"),str("consist of integers"),str("↑"),str("↓"),str("« or »: 𝕩 must have rank at least 1"),str("« or »: 𝕨 must not have higher rank than 𝕩"),str("« or »: Rank of 𝕨 must be at least rank of 𝕩 minus 1"),str("« or »: 𝕨 must share 𝕩\'s major cell shape"),str("𝕨↕𝕩: 𝕨 must have rank at most 1"),str("𝕨↕𝕩: Length of 𝕨 must be at most rank of 𝕩"),str("𝕨↕𝕩: 𝕨 must consist of natural numbers"),str("𝕨↕𝕩: Window length 𝕨 must be at most axis length plus one"),str("First-axis primitive: 𝕩 must have rank at least 1"),str("Multi-axis primitive: 𝕨 must have rank at most 1"),str("Multi-axis primitive: Length of 𝕨 must be at most rank of 𝕩"),str("∊𝕩 or ⊐𝕩: 𝕩 must have rank at least 1"),str("≥: No monadic form"),str("≤: No monadic form"),str("∘⌊⌽↑"),str("𝕨⥊𝕩: 𝕨 must have rank at most 1"),str("𝕨⥊𝕩: 𝕨 must consist of natural numbers"),str("𝕨⥊𝕩: Can\'t compute axis length when rest of shape is empty"),str("𝕨⥊𝕩: 𝕨 must consist of natural numbers or ∘ ⌊ ⌽ ↑"),str("𝕨⥊𝕩: Shape must be exact when reshaping with ∘"),str("𝕨⊑𝕩: Indices in compound 𝕨 must be lists"),str("𝕨⊑𝕩: Index length in 𝕨 must match rank of 𝕩"),str("↕𝕩: 𝕩 must consist of natural numbers"),str("↕𝕩: 𝕩 must be a number or list"),str("⎉ or ⚇: 𝔽 result must have rank at most 1"),str("⎉ or ⚇: 𝔽 result must have 1 to 3 elements"),str("⎉ or ⚇: 𝔽 result must consist of integers"),str("˝: 𝕩 must have rank at least 1"),str("˝: Identity does not exist"),str("𝕨∾𝕩: Rank of 𝕨 and 𝕩 must differ by at most 1"),str("𝕨∾𝕩: Cell shapes of 𝕨 and 𝕩 must match"),str("𝕨/𝕩: Lengths of components of 𝕨 must match 𝕩"),str("⍟: Repetition numbers in 𝕨𝔾𝕩 must be integers"),str("⊔: Grouping argument must consist of integers"),str("⊔: Grouping argument values cannot be less than ¯1"),str("⊔𝕩: 𝕩 must be a list"),str("𝕨⊔𝕩: 𝕩 must be an array"),str("𝕨⊔𝕩: Compound 𝕨 must be a list"),str("𝕨⊔𝕩: Total rank of 𝕨 must be at most rank of 𝕩"),str("𝕨⊔𝕩: Lengths of 𝕨 must equal to 𝕩, or one more only in a rank-1 component"),str("p⊐𝕩 or 𝕨∊p: p must have rank at least 1"),str("p⊐n or n∊p: Rank of n must be at least cell rank of p"),str("⍷𝕩: Rank of 𝕨 cannot exceed rank of 𝕩"),str("𝕨⍉𝕩: 𝕨 must have rank at most 1"),str("𝕨⍉𝕩: Length of 𝕨 must not exceed rank of 𝕩"),str("𝕨⍉𝕩: 𝕨 must consist of natural numbers"),str("𝕨⍉𝕩: Skipped result axis"),str("⊒: Rank of 𝕨 must be at least 1"),str("⊒: Rank of 𝕩 must be at least cell rank of 𝕨"),str("Cannot currently invert blocks"),str("Cannot invert modifier"),str("⁼: Inverse failed"),str("⁼: Inverse does not exist"),str("⁼: Inverse not found")])
- ,[[0,1,0,189],[0,0,4144,3],[0,0,4152,3],[0,0,4156,3],[2,0,4169,6],[0,0,4196,3],[0,0,4200,3],[0,0,4204,3],[1,0,4208,5],[1,0,4216,5],[2,0,4234,6],[2,0,4249,6],[2,0,4268,6],[2,0,4290,6],[2,0,4312,6],[0,0,4344,3],[0,0,4356,3],[0,0,4365,3],[0,0,4371,3],[0,0,4388,3],[0,0,4397,3],[1,0,4406,9],[1,1,4519,2],[2,1,4550,3],[1,1,4584,2],[0,0,4601,3],[0,0,4641,4],[0,0,4717,5],[0,0,4792,3],[2,1,4809,4],[0,0,4887,3],[1,1,4894,4],[1,1,4967,3],[0,0,5045,3],[0,0,5056,4],[1,0,5126,9],[0,0,5198,5],[2,0,5282,12],[1,1,5493,3],[1,0,5517,14],[0,0,5969,4],[0,0,6023,6],[0,0,6113,3],[0,0,6138,7],[0,0,6267,4],[0,0,6328,4],[0,0,6441,3],[0,0,6509,4],[1,1,6586,2],[0,0,6619,3],[0,0,6669,4],[0,0,6811,3],[0,0,6912,4],[2,1,7013,3],[1,0,7056,5],[0,0,7094,3],[2,0,7098,11],[0,0,7229,3],[0,0,7237,6],[0,0,7264,5],[0,0,7285,6],[1,0,7312,19],[0,0,7821,3],[0,0,7848,3],[0,0,7874,3],[2,1,7913,3],[0,0,7982,4],[0,0,8079,7],[0,0,8126,14],[0,0,8360,5],[0,0,8457,3],[1,1,8497,8],[1,0,8550,6],[1,1,8658,2],[0,0,8716,5],[0,0,8878,5],[0,0,9015,7],[0,0,9184,3],[0,0,9243,4],[1,0,9310,5],[2,1,9327,4],[1,0,9370,6],[0,0,9509,3],[0,0,9536,3],[0,0,9558,3],[0,0,9580,3],[0,0,9599,9],[0,0,9764,4],[0,0,9966,3],[0,0,9984,5],[0,0,10018,3],[1,1,10115,2],[2,0,10184,10],[2,0,10243,8],[1,0,10436,7],[0,0,10503,8],[0,0,10743,5],[0,0,10833,3],[2,0,10867,10],[1,0,10942,9],[0,0,11097,4],[0,0,11216,10],[1,1,11680,4],[0,0,11734,4],[0,0,11842,3],[0,0,11918,3],[0,0,11973,4],[0,0,12106,4],[0,0,12228,4],[1,1,12339,2],[2,0,12347,6],[1,1,12362,2],[0,0,12477,3],[0,0,12485,3],[0,0,12493,3],[0,0,12514,8],[0,0,12596,3],[0,0,12604,3],[0,0,12612,3],[0,0,12620,3],[0,0,12628,3],[0,0,12636,3],[0,0,12648,3],[2,0,12673,7],[0,0,12714,6],[0,0,12938,4],[0,0,13044,3],[0,0,13087,5],[0,0,13231,3],[0,0,13278,3],[0,0,13304,3],[1,0,13395,5],[0,0,13423,3],[0,0,13459,3],[0,0,13507,3],[0,0,13561,3],[0,0,13573,3],[1,1,13653,2],[0,0,13683,4],[0,0,13720,3],[0,0,13735,3],[0,0,13764,3],[0,0,13779,3],[0,0,13797,3],[0,0,13812,3],[0,0,13822,3],[2,0,13879,6],[0,0,13907,3],[1,1,13935,2],[1,1,13939,2],[0,0,13943,3],[0,0,13955,3],[0,0,13978,3],[0,0,13999,3],[0,0,14007,3],[1,0,14015,6],[1,0,14132,11],[1,0,14353,5],[0,0,14368,3],[0,0,14382,3],[0,0,14396,7],[0,0,14509,6],[0,0,14557,3],[1,0,14602,8],[0,0,14740,4],[0,0,14767,3],[0,0,14786,8],[0,0,14953,3],[0,0,14979,3],[0,0,14989,3],[0,0,15006,9],[0,0,15189,6],[0,0,15264,3],[2,0,15272,11],[1,0,15349,5],[0,0,15380,3],[0,0,15390,3],[1,0,15400,5],[0,0,15433,4],[0,0,15444,4],[0,0,15455,3],[0,0,15463,3],[0,0,15475,3],[0,0,15483,3],[1,0,15527,7],[0,0,15553,9],[1,0,15839,5],[0,0,15855,7],[0,0,16022,11],[0,0,16264,8],[0,0,16576,3],[0,0,16604,5],[0,0,16699,8],[0,0,16958,3],[0,0,17005,3],[0,0,17025,3],[1,0,17091,6],[0,0,17244,7],[0,0,17386,5],[0,0,17466,3],[0,0,17489,3],[0,0,17500,3],[0,0,17521,3],[0,0,17532,3],[0,0,17540,9],[0,0,17684,3],[0,0,17713,3],[0,0,17745,3],[0,0,17776,3],[0,0,17814,4],[0,0,17991,3],[0,0,18009,3],[0,0,18034,3],[0,0,18056,3],[0,0,18067,3],[1,1,18081,2],[1,0,18085,5],[1,0,18096,5],[0,0,18107,5],[0,0,18217,3],[0,0,18269,14],[0,0,18439,3],[0,0,18462,3],[0,0,18482,3],[0,0,18497,3],[0,0,18505,8],[0,0,18576,3],[0,0,18598,5],[0,0,18627,11],[2,0,18839,6],[0,0,18878,3],[0,0,18949,3],[0,0,18981,3],[1,0,18992,5],[1,1,19003,2],[2,1,19022,3],[0,0,19044,3],[0,0,19073,4],[0,0,19096,3],[1,0,19129,5],[0,0,19155,3],[0,0,19225,3],[0,0,19239,3],[0,0,19250,5],[0,0,19386,3],[0,0,19416,3],[0,0,19436,3],[0,0,19490,3],[0,0,19525,3],[0,0,19549,3],[0,0,19564,3],[1,0,19607,5],[0,0,19618,3],[0,0,19661,3],[0,0,19682,5],[2,0,19811,6],[1,1,19826,2],[1,1,19834,2],[0,0,19842,5],[0,0,19881,3],[0,0,19920,3],[0,0,20003,3],[0,0,20037,3],[0,0,20066,3],[0,0,20084,3],[0,0,20101,6],[0,0,20181,3],[0,0,20210,4],[0,0,20271,3],[0,0,20284,4],[0,0,20316,3],[0,0,20326,3],[0,0,20344,3],[0,0,20376,3],[0,0,20403,3],[0,0,20443,3]]
+ ,[[0,1,0,190],[0,0,4152,3],[0,0,4160,3],[0,0,4164,3],[2,0,4177,6],[0,0,4204,3],[0,0,4208,3],[0,0,4212,3],[1,0,4216,5],[1,0,4224,5],[2,0,4242,6],[2,0,4257,6],[2,0,4276,6],[2,0,4298,6],[2,0,4320,6],[0,0,4352,3],[0,0,4364,3],[0,0,4373,3],[0,0,4379,3],[0,0,4396,3],[0,0,4405,3],[1,0,4414,9],[1,1,4527,2],[2,1,4558,3],[1,1,4592,2],[0,0,4609,4],[0,0,4685,3],[0,0,4725,5],[0,0,4800,3],[2,1,4817,4],[0,0,4895,3],[1,1,4902,4],[1,1,4975,3],[0,0,5053,3],[0,0,5064,4],[1,0,5134,9],[0,0,5206,5],[2,0,5290,12],[1,1,5501,3],[1,0,5525,14],[0,0,5977,4],[0,0,6031,6],[0,0,6121,3],[0,0,6146,7],[0,0,6275,4],[0,0,6336,4],[0,0,6449,3],[0,0,6517,4],[1,1,6594,2],[0,0,6627,3],[0,0,6677,4],[0,0,6819,3],[0,0,6920,4],[2,1,7021,3],[1,0,7064,5],[0,0,7102,3],[2,0,7106,11],[0,0,7237,3],[0,0,7245,6],[0,0,7272,5],[0,0,7293,6],[1,0,7320,19],[0,0,7823,3],[0,0,7850,3],[0,0,7876,3],[2,1,7915,3],[0,0,7984,4],[0,0,8081,7],[0,0,8128,14],[0,0,8362,5],[0,0,8459,3],[1,1,8499,8],[1,0,8552,6],[1,1,8660,2],[0,0,8718,5],[0,0,8880,5],[0,0,9017,7],[0,0,9186,3],[0,0,9245,4],[1,0,9312,5],[2,1,9329,4],[1,0,9372,6],[0,0,9511,3],[0,0,9538,3],[0,0,9560,3],[0,0,9582,3],[0,0,9601,9],[0,0,9766,4],[0,0,9968,3],[0,0,9986,5],[0,0,10020,3],[1,1,10117,2],[2,0,10186,10],[2,0,10245,8],[1,0,10438,7],[0,0,10505,8],[0,0,10745,5],[0,0,10835,3],[2,0,10869,10],[1,0,10944,9],[0,0,11099,4],[0,0,11218,10],[1,1,11682,4],[0,0,11736,4],[0,0,11844,3],[0,0,11920,3],[0,0,11975,4],[0,0,12108,4],[0,0,12230,4],[1,1,12341,2],[2,0,12349,6],[1,1,12364,2],[0,0,12479,3],[0,0,12487,3],[0,0,12495,3],[0,0,12516,8],[0,0,12598,3],[0,0,12606,3],[0,0,12614,3],[0,0,12622,3],[0,0,12630,3],[0,0,12638,3],[0,0,12650,3],[2,0,12675,7],[0,0,12716,6],[0,0,12940,4],[0,0,13046,3],[0,0,13089,5],[0,0,13233,3],[0,0,13280,3],[0,0,13306,3],[1,0,13397,5],[0,0,13425,3],[0,0,13461,3],[0,0,13509,3],[0,0,13563,3],[0,0,13575,3],[1,1,13655,2],[0,0,13685,4],[0,0,13722,3],[0,0,13737,3],[0,0,13766,3],[0,0,13781,3],[0,0,13799,3],[0,0,13814,3],[0,0,13824,3],[2,0,13881,6],[0,0,13909,3],[1,1,13937,2],[1,1,13941,2],[0,0,13945,3],[0,0,13957,3],[0,0,13980,3],[0,0,14001,3],[0,0,14009,3],[1,0,14017,6],[1,0,14134,11],[1,0,14355,5],[0,0,14370,3],[0,0,14384,3],[0,0,14398,7],[0,0,14511,6],[0,0,14559,3],[1,0,14604,8],[0,0,14742,4],[0,0,14769,3],[0,0,14788,8],[0,0,14955,3],[0,0,14981,3],[0,0,14991,3],[0,0,15008,9],[0,0,15191,6],[0,0,15266,3],[2,0,15274,11],[1,0,15351,5],[0,0,15382,3],[0,0,15392,3],[1,0,15402,5],[0,0,15435,4],[0,0,15446,4],[0,0,15457,3],[0,0,15465,3],[0,0,15483,3],[0,0,15491,3],[1,0,15535,7],[0,0,15561,9],[1,0,15847,5],[0,0,15863,7],[0,0,16030,11],[0,0,16272,8],[0,0,16584,3],[0,0,16612,5],[0,0,16707,8],[0,0,16966,3],[0,0,17013,3],[0,0,17033,3],[1,0,17099,6],[0,0,17252,7],[0,0,17394,5],[0,0,17474,3],[0,0,17497,3],[0,0,17508,3],[0,0,17529,3],[0,0,17540,3],[0,0,17548,9],[0,0,17692,3],[0,0,17721,3],[0,0,17753,3],[0,0,17784,3],[0,0,17822,4],[0,0,17999,3],[0,0,18017,3],[0,0,18042,3],[0,0,18064,3],[0,0,18075,3],[1,1,18089,2],[1,0,18093,5],[1,0,18104,5],[0,0,18115,5],[0,0,18225,3],[0,0,18277,14],[0,0,18447,3],[0,0,18470,3],[0,0,18490,3],[0,0,18505,3],[0,0,18513,8],[0,0,18584,3],[0,0,18606,5],[0,0,18635,11],[2,0,18847,6],[0,0,18886,3],[0,0,18957,3],[0,0,18989,3],[1,0,19000,5],[1,1,19011,2],[2,1,19030,3],[0,0,19052,3],[0,0,19081,4],[0,0,19104,3],[1,0,19137,5],[0,0,19163,3],[0,0,19233,3],[0,0,19247,3],[0,0,19258,5],[0,0,19394,3],[0,0,19424,3],[0,0,19444,3],[0,0,19498,3],[0,0,19533,3],[0,0,19557,3],[0,0,19572,3],[1,0,19615,5],[0,0,19626,3],[0,0,19669,3],[0,0,19690,5],[2,0,19819,6],[1,1,19834,2],[1,1,19842,2],[0,0,19850,5],[0,0,19889,3],[0,0,19928,3],[0,0,20011,3],[0,0,20045,3],[0,0,20074,3],[0,0,20092,3],[0,0,20109,6],[0,0,20189,3],[0,0,20218,4],[0,0,20279,3],[0,0,20292,4],[0,0,20324,3],[0,0,20334,3],[0,0,20352,3],[0,0,20384,3],[0,0,20411,3],[0,0,20451,3]]
 );
 
 let rtAssert = runtime[42] = assertFn("!");
diff --git a/src/r.bqn b/src/r.bqn
index a893613b..582da30a 100644
--- a/src/r.bqn
+++ b/src/r.bqn
@@ -50,9 +50,9 @@ _glyphLookup_ ← {
 _isGlyph ← { (glyphs _qSearch 𝕗) = {PrimInd𝕩} }
 IsJoin ← '∾'_isGlyph
 
-Cell←{(𝕨⊸+⊑𝕩˙)⌜↕(≠𝕩)-𝕨}⟜≢
-
-∾ ← {k←≠𝕨⋄k⊸≤◶⟨⊑⟜𝕨⋄-⟜k⊑𝕩˜⟩⌜↕k+≠𝕩}  # LIMITED to two vector arguments
+∾ ← {k←≠𝕨⋄k⊸≤◶⟨⊑⟜𝕨⋄-⟜k⊑𝕩˜⟩⌜↕k+≠𝕩}  # LIMITED to two list arguments
+↓ ← {(𝕨⊸+⊑𝕩˙)⌜↕(≠𝕩)-𝕨}             # LIMITED to number 𝕨 and list 𝕩
+Cell ← ↓⟜≢
 
 GetCells←(1==∘⊢)◶{
   c←1×´s←1 Cell 𝕩
@@ -334,11 +334,11 @@ _structural←{
     (Type-3˙)◶⟨NS, {m←𝕩⋄{NS(𝕗_m)˙0}}, {m←𝕩⋄{NS(𝕗_m_𝕘)˙0}}⟩
   ⟩˙
   StructFn ← (0⊸⊑ 0⊸≤◶⟨3,2⊸≤◶⊢‿2⟩∘⊣◶⟨
-    SE · StructPrim 0⊑⊢     #  0 primitive
-    E˙                      #  1 block
-    Recompose⟜{StructFn¨𝕩}  #    other operation
-    SE 0⊑⊢                  # ¯1 constant
-  ⟩ 1⊸Drop) Decompose
+    SE · StructPrim 1⊑⊢      #  0 primitive
+    E˙                       #  1 block
+    Recompose⟜{StructFn¨1↓𝕩} #    other operation
+    SE 1⊑⊢                   # ¯1 constant
+  ⟩ ⊢) Decompose
   IsStruct◶⟨0‿StructErr,1‿3⊏Decompose⟩ {𝕎𝕩}´ ⟨StructFn 𝕗, ¯1 _s_ 0⟩
 }
 
@@ -596,7 +596,7 @@ _insert←{
   "˝: 𝕩 must have rank at least 1" ! 1≤=𝕩
   F←𝔽
   Id ← {
-    s ← 1 Drop ≢𝕩
+    s ← 1↓≢𝕩
     JoinSh ← {"˝: Identity does not exist"!0<≠𝕨 ⋄ 𝕨×0<↕≠𝕨}
     s ¬∘IsJoin∘⊢◶⟨JoinSh⥊𝕩˙, Reshape⟜Identity⟩ f
   }
@@ -638,8 +638,8 @@ _repeat_←{
   (Nat n)◶Multi‿{𝕩(B f)∘⊢´↕n} 𝕩
 }
 
-↑ ← Prefixes       ⊘ Take
-↓ ← Suffixes       ⊘ Drop
+↑ ↩ Prefixes       ⊘ Take
+↓ ↩ Suffixes       ⊘ Drop
 ↕ ↩ Range          ⊘ Windows
 ⌽ ← Reverse        ⊘ (Rot _onAxes_ 0)
 / ← Indices        ⊘ Replicate