fix: using f64 in get_float instead of f32 sl-sh-dev#123 (comment)

Author: StevenLove

vm/src/value.rs

@@ -457,11 +457,11 @@ impl Value {
         }
     }
 
-    pub fn get_float<ENV>(&self, _vm: &GVm<ENV>) -> VMResult<f32> {
+    pub fn get_float<ENV>(&self, _vm: &GVm<ENV>) -> VMResult<f64> {
         match &self {
-            Value::Byte(b) => Ok(*b as f32),
-            Value::Int(i) => Ok(from_i56(i) as f32),
-            Value::Float(f) => Ok(f32::from(*f)),
+            Value::Byte(b) => Ok(*b as f64),
+            Value::Int(i) => Ok(from_i56(i) as f64),
+            Value::Float(f) => Ok(f64::from(*f)),
             _ => Err(VMError::new_value(format!("Not a float: {self:?}"))),
         }
     }

vm/src/vm.rs

@@ -4,7 +4,7 @@ use std::sync::Arc;
 
 use crate::{
     from_i56, CallFrame, CallFunc, CallFuncSig, Chunk, Globals, Handle, Heap, Interner, VMError,
-    VMErrorObj, VMResult, Value, HALT,
+    VMErrorObj, VMResult, Value, F56, HALT,
 };
 
 mod cons;
@@ -220,7 +220,7 @@ impl<ENV> GVm<ENV> {
                 val = Value::True;
             }
         } else if val1.is_number() && val2.is_number() {
-            if (val1.get_float(self)? - val2.get_float(self)?).abs() < f32::EPSILON {
+            if (val1.get_float(self)? - val2.get_float(self)?).abs() < F56::EPSILON {
                 val = Value::True;
             }
         } else {
@@ -911,7 +911,9 @@ mod tests {
         let chunk = Arc::new(chunk);
         vm.execute(chunk)?;
         let result = vm.stack(5).get_float(&vm)?;
-        assert!(result == 12500.0);
+
+        // NOTE: converting the result to f32 because the f64 expects more precision than our F56 can provide.
+        assert_eq!(result as f32, 12500.0);
 
         Ok(())
     }