Update runtime provided functions table

2 files changed, 61 insertions, 43 deletions

diff --git a/docs/implementation/vm.html b/docs/implementation/vm.html
index 829c755d..46a8aa06 100644
--- a/docs/implementation/vm.html
+++ b/docs/implementation/vm.html
@@ -393,106 +393,121 @@
 <tbody>
 <tr>
 <td align="right">0</td>
-<td><code><span class='Function'>IsArray</span></code></td>
-<td>1 if the right argument is an array, 0 otherwise</td>
+<td><code><span class='Function'>Type</span></code></td>
+<td><code><span class='Function'>•Type</span></code></td>
 </tr>
 <tr>
 <td align="right">1</td>
-<td><code><span class='Function'>Type</span></code></td>
-<td>The fill value for array <code><span class='Value'>𝕩</span></code></td>
+<td><code><span class='Function'>Decompose</span></code></td>
+<td><code><span class='Function'>•Decompose</span></code></td>
 </tr>
 <tr>
 <td align="right">2</td>
+<td><code><span class='Function'>Glyph</span></code></td>
+<td>(Unused) <code><span class='Function'>•Glyph</span></code> for primitive <code><span class='Value'>𝕩</span></code></td>
+</tr>
+<tr>
+<td align="right">3</td>
+<td><code><span class='Function'>Fill</span></code></td>
+<td>Get or set the fill value for array <code><span class='Value'>𝕩</span></code></td>
+</tr>
+<tr>
+<td align="right">4</td>
 <td><code><span class='Function'>Log</span></code></td>
 <td><code><span class='Function'>⋆</span><span class='Modifier'>⁼</span></code> (natural or base-<code><span class='Value'>𝕨</span></code> logarithm) for atomic arguments</td>
 </tr>
 <tr>
-<td align="right">3</td>
+<td align="right">5</td>
 <td><code><span class='Function'>GroupLen</span></code></td>
 <td><code><span class='Function'>≠</span><span class='Modifier'>¨</span><span class='Function'>⊔</span><span class='Value'>𝕩</span></code> for a valid list <code><span class='Value'>𝕩</span></code></td>
 </tr>
 <tr>
-<td align="right">4</td>
+<td align="right">6</td>
 <td><code><span class='Function'>GroupOrd</span></code></td>
 <td><code><span class='Function'>∾⊔</span><span class='Value'>𝕩</span></code> provided <code><span class='Value'>𝕨</span></code> is <code><span class='Function'>GroupLen</span> <span class='Value'>𝕩</span></code></td>
 </tr>
 <tr>
-<td align="right">5</td>
+<td align="right">7</td>
 <td><code><span class='Function'>!</span></code></td>
 <td></td>
 </tr>
 <tr>
-<td align="right">6</td>
+<td align="right">8</td>
 <td><code><span class='Function'>+</span></code></td>
 <td>On two atoms</td>
 </tr>
 <tr>
-<td align="right">7</td>
+<td align="right">9</td>
 <td><code><span class='Function'>-</span></code></td>
 <td>On one or two atoms</td>
 </tr>
 <tr>
-<td align="right">8</td>
+<td align="right">10</td>
 <td><code><span class='Function'>×</span></code></td>
 <td>On two atoms</td>
 </tr>
 <tr>
-<td align="right">9</td>
+<td align="right">11</td>
 <td><code><span class='Function'>÷</span></code></td>
 <td>On one or two atoms</td>
 </tr>
 <tr>
-<td align="right">10</td>
+<td align="right">12</td>
 <td><code><span class='Function'>⋆</span></code></td>
 <td>On one or two atoms</td>
 </tr>
 <tr>
-<td align="right">11</td>
+<td align="right">13</td>
 <td><code><span class='Function'>⌊</span></code></td>
 <td>On one atom</td>
 </tr>
 <tr>
-<td align="right">12</td>
+<td align="right">14</td>
 <td><code><span class='Function'>=</span></code></td>
 <td>On one value or two atoms</td>
 </tr>
 <tr>
-<td align="right">13</td>
+<td align="right">15</td>
 <td><code><span class='Function'>≤</span></code></td>
 <td>On two atoms</td>
 </tr>
 <tr>
-<td align="right">14</td>
+<td align="right">16</td>
 <td><code><span class='Function'>≢</span></code></td>
 <td>For array <code><span class='Value'>𝕩</span></code></td>
 </tr>
 <tr>
-<td align="right">15</td>
+<td align="right">17</td>
 <td><code><span class='Function'>⥊</span></code></td>
 <td>For array <code><span class='Value'>𝕩</span></code> with no <code><span class='Value'>𝕨</span></code> or <code><span class='Value'>𝕨</span><span class='Function'>=</span><span class='Modifier2'>○</span><span class='Paren'>(</span><span class='Function'>×</span><span class='Modifier'>´</span><span class='Paren'>)</span><span class='Function'>≢</span><span class='Value'>𝕩</span></code></td>
 </tr>
 <tr>
-<td align="right">16</td>
+<td align="right">18</td>
 <td><code><span class='Function'>⊑</span></code></td>
 <td>For atom <code><span class='Value'>𝕨</span></code> and list <code><span class='Value'>𝕩</span></code></td>
 </tr>
 <tr>
-<td align="right">17</td>
+<td align="right">19</td>
 <td><code><span class='Function'>↕</span></code></td>
 <td>For natural number <code><span class='Value'>𝕩</span></code></td>
 </tr>
 <tr>
-<td align="right">18</td>
+<td align="right">20</td>
 <td><code><span class='Modifier'>⌜</span></code></td>
 <td>On arrays</td>
 </tr>
 <tr>
-<td align="right">19</td>
+<td align="right">21</td>
 <td><code><span class='Modifier'>`</span></code></td>
 <td></td>
 </tr>
 <tr>
-<td align="right">20</td>
+<td align="right">22</td>
+<td><code><span class='Modifier2'>_fillBy_</span></code></td>
+<td><code><span class='Function'>𝔽</span></code> with result fill computed using <code><span class='Function'>𝔾</span></code></td>
+</tr>
+<tr>
+<td align="right">23</td>
 <td><code><span class='Modifier2'>⊘</span></code></td>
 <td></td>
 </tr>
diff --git a/implementation/vm.md b/implementation/vm.md
index cc86180e..302717e0 100644
--- a/implementation/vm.md
+++ b/implementation/vm.md
@@ -119,27 +119,30 @@ The contents of a core runtime are given below. The names given are those used i
 
 | Ind | Name       | Description / restrictions
 |----:|------------|---------------------------
-|   0 | `IsArray`  | 1 if the right argument is an array, 0 otherwise
-|   1 | `Type`     | The fill value for array `𝕩`
-|   2 | `Log`      | `⋆⁼` (natural or base-`𝕨` logarithm) for atomic arguments
-|   3 | `GroupLen` | `≠¨⊔𝕩` for a valid list `𝕩`
-|   4 | `GroupOrd` | `∾⊔𝕩` provided `𝕨` is `GroupLen 𝕩`
-|   5 | `!`        |
-|   6 | `+`        | On two atoms
-|   7 | `-`        | On one or two atoms
-|   8 | `×`        | On two atoms
-|   9 | `÷`        | On one or two atoms
-|  10 | `⋆`        | On one or two atoms
-|  11 | `⌊`        | On one atom
-|  12 | `=`        | On one value or two atoms
-|  13 | `≤`        | On two atoms
-|  14 | `≢`        | For array `𝕩`
-|  15 | `⥊`        | For array `𝕩` with no `𝕨` or `𝕨=○(×´)≢𝕩`
-|  16 | `⊑`        | For atom `𝕨` and list `𝕩`
-|  17 | `↕`        | For natural number `𝕩`
-|  18 | `⌜`        | On arrays
-|  19 | `` ` ``    |
-|  20 | `⊘`        |
+|   0 | `Type`     | `•Type`
+|   1 | `Decompose`| `•Decompose`
+|   2 | `Glyph`    | (Unused) `•Glyph` for primitive `𝕩`
+|   3 | `Fill`     | Get or set the fill value for array `𝕩`
+|   4 | `Log`      | `⋆⁼` (natural or base-`𝕨` logarithm) for atomic arguments
+|   5 | `GroupLen` | `≠¨⊔𝕩` for a valid list `𝕩`
+|   6 | `GroupOrd` | `∾⊔𝕩` provided `𝕨` is `GroupLen 𝕩`
+|   7 | `!`        |
+|   8 | `+`        | On two atoms
+|   9 | `-`        | On one or two atoms
+|  10 | `×`        | On two atoms
+|  11 | `÷`        | On one or two atoms
+|  12 | `⋆`        | On one or two atoms
+|  13 | `⌊`        | On one atom
+|  14 | `=`        | On one value or two atoms
+|  15 | `≤`        | On two atoms
+|  16 | `≢`        | For array `𝕩`
+|  17 | `⥊`        | For array `𝕩` with no `𝕨` or `𝕨=○(×´)≢𝕩`
+|  18 | `⊑`        | For atom `𝕨` and list `𝕩`
+|  19 | `↕`        | For natural number `𝕩`
+|  20 | `⌜`        | On arrays
+|  21 | `` ` ``    |
+|  22 | `_fillBy_` | `𝔽` with result fill computed using `𝔾`
+|  23 | `⊘`        |
 
 Remember that `+` and `-` can also work on characters in some circumstances, under the rules of affine characters. Other arithmetic functions should only accept numbers. `=` must work on numbers, characters, and primitives, and should give `0` without causing an error if the arguments have different types or one is a primitive and the other isn't. `≤` must work on numbers and characters.