make unjson not form multidimensional arrays

changelog.md

@@ -5,6 +5,8 @@ Uiua is not yet stable.
 ## 0.14.0 - 202?-??-??
 This version is not yet released. If you are reading this on the website, then these changes are live here.
 ### Language
+- **Breaking Change**: [`un °`](https://uiua.org/docs/un) [`json`](https://uiua.org/docs/language/json) no longer attempts to form multidimensional arrays
+  - This makes deserializing JSON more consistent
 - Add experimental inline macros
 - Remove the previously deprecated experimental `coordinate ⟔` function
 - Remove the previously deprecated experimental `struct` modifier
@@ -14,7 +16,7 @@ This version is not yet released. If you are reading this on the website, then t
   - This massively simplifies compilation as well as optimizations and the derivation of inverses
   - This should not affect any language semantics
 - Improve pattern matching error messages
-- Optimize the pattern `ⁿ%:1`
+- Optimize the "root" pattern `ⁿ%:1`
 ### Website
 - Add a new pad setting to show line values to the right of the code
 

src/algorithm/monadic.rs

@@ -1875,9 +1875,11 @@ impl Value {
                     }
                     rows.push(value);
                 }
-                if rows.windows(2).all(|win| {
-                    win[0].shape() == win[1].shape() && win[0].type_name() == win[1].type_name()
-                }) {
+                if rows.iter().all(|val| val.shape().is_empty())
+                    && rows
+                        .windows(2)
+                        .all(|win| win[0].type_id() == win[1].type_id())
+                {
                     Value::from_row_values_infallible(rows)
                 } else {
                     Array::from(

src/primitive/defs.rs

@@ -3232,6 +3232,9 @@ primitive!(
     /// While the number literals `0` and `1` are converted to their number equivalents in JSON, the shadowable constants `True` and `False` are converted to JSON `true` and `false`.
     /// ex: json {0 1 2 3 True False}
     ///
+    /// [un][json] will never form multidimensional arrays, as the shape data is lost.
+    /// ex: °json json [1_2_3 4_5_6]
+    ///
     /// While [json] always produces ECMA-compliant JSON, [un][json] can parse [JSON5](https://json5.org/).
     /// This means that you can use single quotes, unquoted keys, trailing commas, and comments.
     /// ex: °json $ {foo: 'bar', /* cool */ baz: [1, 2, 3,],}