More propagation of numeric types (#6177)

Signed-off-by: Nick Cameron <nrc@ncameron.org>

rust/kcl-lib/src/execution/state.rs

@@ -22,6 +22,8 @@ use crate::{
     CompilationError,
 };
 
+use super::types::NumericType;
+
 /// State for executing a program.
 #[derive(Debug, Clone)]
 pub struct ExecState {
@@ -228,6 +230,13 @@ impl ExecState {
         self.global.module_infos.insert(id, module_info);
     }
 
+    pub fn current_default_units(&self) -> NumericType {
+        NumericType::Default {
+            len: self.length_unit(),
+            angle: self.angle_unit(),
+        }
+    }
+
     pub fn length_unit(&self) -> UnitLen {
         self.mod_local.settings.default_length_units
     }