fix: remove inconsistent handling of low-rank inputs of unbytes (#825)

Author: magistau

src/algorithm/encode.rs

@@ -461,19 +461,13 @@ impl Value {
             }
         };
         let mut new_shape = bytes.shape;
-        if new_shape.is_empty() {
-            new_shape.push(1);
-        }
-        if new_shape.len() > 1 {
-            let last_dim = new_shape.pop().unwrap();
+        if let Some(last_dim) = new_shape.pop() {
             if last_dim != elem_size {
                 return Err(env.error(format!(
                     "Bytes shape has last axis size {last_dim}, \
                     which does not match format {format}"
                 )));
             }
-        } else {
-            new_shape[0] = (new_shape[0] / elem_size).max(1);
         }
         let mut data = eco_vec![0.0; new_shape.elements()];
         let slice = data.make_mut();

tests/dyadic.ua

@@ -312,9 +312,10 @@ F ← ⊂0 [⊙⊙∘]
 ⍤⤙≍ ¯3 ∨ 3 ¯∞
 
 # Bytes
-⍤⤙≍ ⊃⋅¤⍜bytes∘ "u32" 6
-⍤⤙≍ ⊃⋅¤⍜bytes∘ "f64" 6
+⍤⤙≍ ⤙⍜bytes∘ "u32" 6
+⍤⤙≍ ⤙⍜bytes∘ "f64" 6
 ⍤⤙≍ ⤙⍜bytes∘ "u32" [6]
 ⍤⤙≍ ⤙⍜bytes∘ "f64" [6]
 ⍤⤙≍ ⤙⍜bytes∘ "u32" [1 2 3]
-⍤⤙≍ [1 2 3 4] ⌝bytes "u32" [1 0 0 0 2 0 0 0 3 0 0 0 4 0 0 0]
+⍤⤙≍ [1 2 3 4] ⌝bytes "u32" [[1 0 0 0] [2 0 0 0] [3 0 0 0] [4 0 0 0]]
+⍤⤙≍ 6 ⌝bytes "f64" [0 0 0 0 0 0 24 64]