fix: strip style prefix for label/matrix primitive parameters (#99)

bindparam.go

@@ -152,8 +152,16 @@ func BindStyledParameterWithOptions(style string, paramName string, value string
 		return bindSplitPartsToDestinationArray(parts, dest)
 	}
 
-	// Try to bind the remaining types as a base type.
-	return BindStringToObject(value, dest)
+	// For primitive types, we still need to strip style prefixes (e.g. label's
+	// leading "." or matrix's ";paramName=") before binding.
+	parts, err := splitStyledParameter(style, opts.Explode, false, paramName, value)
+	if err != nil {
+		return fmt.Errorf("error splitting parameter '%s': %w", paramName, err)
+	}
+	if len(parts) != 1 {
+		return fmt.Errorf("parameter '%s': expected single value, got %d parts", paramName, len(parts))
+	}
+	return BindStringToObject(parts[0], dest)
 }
 
 // This is a complex set of operations, but each given parameter style can be

bindparam_test.go

@@ -1101,6 +1101,54 @@ func TestRoundTripQueryParameter(t *testing.T) {
 	})
 }
 
+func TestBindStyledParameterWithOptions_LabelPrimitive(t *testing.T) {
+	tests := []struct {
+		name    string
+		explode bool
+		value   string
+		want    int32
+	}{
+		{"non-exploded", false, ".5", 5},
+		{"exploded", true, ".5", 5},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var dest int32
+			err := BindStyledParameterWithOptions("label", "param", tt.value, &dest, BindStyledParameterOptions{
+				ParamLocation: ParamLocationPath,
+				Explode:       tt.explode,
+				Required:      true,
+			})
+			require.NoError(t, err)
+			assert.Equal(t, tt.want, dest)
+		})
+	}
+}
+
+func TestBindStyledParameterWithOptions_MatrixPrimitive(t *testing.T) {
+	tests := []struct {
+		name    string
+		explode bool
+		value   string
+		want    int32
+	}{
+		{"non-exploded", false, ";param=5", 5},
+		{"exploded", true, ";param=5", 5},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var dest int32
+			err := BindStyledParameterWithOptions("matrix", "param", tt.value, &dest, BindStyledParameterOptions{
+				ParamLocation: ParamLocationPath,
+				Explode:       tt.explode,
+				Required:      true,
+			})
+			require.NoError(t, err)
+			assert.Equal(t, tt.want, dest)
+		})
+	}
+}
+
 func TestBindStyledParameterWithLocation(t *testing.T) {
 	t.Run("bigNumber", func(t *testing.T) {
 		expectedBig := big.NewInt(12345678910)