fix: UnmarshalJSON fixed for values without '.'

decimal64p2.go

@@ -3,6 +3,7 @@ package decimal
 import (
 	"encoding/json"
 	"math"
+	"slices"
 	"strconv"
 	"strings"
 )
@@ -117,13 +118,21 @@ func (d Decimal64p2) MarshalJSON() ([]byte, error) {
 	return []byte(d.String()), nil
 }
 
-// UnmarshalJSON unmarshals JSON to decimal
+// UnmarshalJSON deserializes JSON to decimal
 func (d *Decimal64p2) UnmarshalJSON(data []byte) error {
-	var f float64
-	if err := json.Unmarshal(data, &f); err != nil {
-		return err
+	if slices.Contains(data, '.') {
+		var f float64
+		if err := json.Unmarshal(data, &f); err != nil {
+			return err
+		}
+		*d = NewDecimal64p2FromFloat64(f)
+	} else {
+		var f int64
+		if err := json.Unmarshal(data, &f); err != nil {
+			return err
+		}
+		*d = Decimal64p2(f)
 	}
-	*d = NewDecimal64p2FromFloat64(f)
 	return nil
 }
 

decimal64p2_test.go

@@ -45,7 +45,8 @@ func TestParseDecimal64p2(t *testing.T) {
 		t.Error(err)
 	} else if d != 0 {
 		t.Errorf("Expected 0, got: %v", d)
-	} else if d.String() != "0" {
+	} else if //goland:noinspection GoDfaNilDereference
+	d.String() != "0" {
 		t.Errorf("Expected 0, got: %v", d.String())
 	}
 
@@ -211,6 +212,14 @@ func TestDecimal64p2_MarshalJSON(t *testing.T) {
 func TestDecimal64p2_UnmarshalJSON(t *testing.T) {
 	var d2 Decimal64p2
 
+	if err := json.Unmarshal([]byte("1234"), &d2); err != nil {
+		t.Error(err)
+	} else if intPart := d2.IntPart(); intPart != 12 {
+		t.Errorf("Expected 12 for int part, got %d: %s", intPart, d2.String())
+	} else if decimalPart := d2.DecimalPart(); decimalPart != 34 {
+		t.Errorf("Expected 0 for decimal part, got %d: %s", decimalPart, d2.String())
+	}
+
 	if err := json.Unmarshal([]byte("1.23"), &d2); err != nil {
 		t.Error(err)
 	} else if d2.IntPart() != 1 || d2.DecimalPart() != 23 {