Potential fix for code scanning alert no. 208: Incorrect conversion between integer types

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: joel-rieke

sql/system_enumtype.go

@@ -94,15 +94,19 @@ func (t systemEnumType) Convert(v interface{}) (interface{}, error) {
 	case int64:
 		return t.Convert(int(value))
 	case uint64:
-		return t.Convert(int(value))
+		if value <= math.MaxInt {
+			return t.Convert(int(value))
+		}
+		return nil, ErrInvalidSystemVariableValue.New(t.varName, value)
 	case float32:
 		return t.Convert(float64(value))
 	case float64:
 		// Float values aren't truly accepted, but the engine will give them when it should give ints.
 		// Therefore, if the float doesn't have a fractional portion, we treat it as an int.
-		if value == float64(int(value)) {
+		if value == float64(int(value)) && value <= float64(math.MaxInt) {
 			return t.Convert(int(value))
 		}
+		return nil, ErrInvalidSystemVariableValue.New(t.varName, value)
 	case decimal.Decimal:
 		f, _ := value.Float64()
 		return t.Convert(f)