types/description: rename the size query for description to 'bytes'

This tends to cause less confusion for consumers about the exact meaning
of 'size'. It gets confused with arity quite often.

types/description.hpp

@@ -73,6 +73,10 @@ namespace cruft::types {
     /// A description of the type that makes up a scalar or vector type.
     ///
     /// A vector3f would be { REAL, sizeof(float), 3 };
+    ///
+    /// DO NOT add a 'size' member function as it tends to be used in a way
+    /// that confuses total byte size, element byte size, and arity.
+    /// Instead: use the bytes member function, or the arity member variable.
     struct description {
         /// The signed, realness, or voidness of the type.
         enum category category;
@@ -86,7 +90,11 @@ namespace cruft::types {
         std::size_t alignment;
 
         /// Returns the number of bytes required to store this type.
-        constexpr std::size_t size (void) const noexcept { return width * arity; }
+        constexpr std::size_t
+        bytes (void) const noexcept
+        {
+            return width * arity;
+        }
     };