优化int64的转换

to_int64.go

@@ -2,7 +2,7 @@ package convx
 
 import (
 	"errors"
-	"strconv"
+	"math/big"
 )
 
 // interface 转 int64
@@ -37,7 +37,15 @@ func ToInt64(val interface{}) (i int64, err error) {
 	case float64:
 		return int64(v), nil
 	case string:
-		return strconv.ParseInt(v, 10, 64)
+		num := new(big.Float)
+		_, ok := num.SetString(v)
+		if !ok {
+			return 0, errors.New("convx.ToInt64: out of range")
+		}
+
+		i, _ := num.Int64()
+		// fmt.Println(val, i, b)
+		return i, nil
 	case bool:
 		if v {
 			return 1, nil
@@ -47,4 +55,3 @@ func ToInt64(val interface{}) (i int64, err error) {
 	}
 	return 0, errors.New("convx.ToInt64: unknown type")
 }
-