fix #39. use json.Number in oauth result map so that expires can be…

… parsed correctly.

facebook_test.go

@@ -1417,8 +1417,8 @@ func TestCamelCaseToUnderScore(t *testing.T) {
 func TestMakeSliceResult(t *testing.T) {
 	jsonStr := `{
 		"error": {
-			"message": "Invalid OAuth access token.", 
-			"type": "OAuthException", 
+			"message": "Invalid OAuth access token.",
+			"type": "OAuthException",
 			"code": 190
 		}
 	}`
@@ -1467,3 +1467,47 @@ func TestMakeSliceResultWithNilElements(t *testing.T) {
 		t.Fatalf("decode res is not expected. [res:%v]", res)
 	}
 }
+
+// case for #39.
+func TestResultDecodeNumberString(t *testing.T) {
+	res := Result{
+		"int":    json.Number("1234"),
+		"string": json.Number("1234"),
+		"float":  json.Number("1234"),
+	}
+
+	var intValue int64
+	var strValue string
+	var floatValue float32
+	var err error
+
+	err = res.DecodeField("int", &intValue)
+
+	if err != nil {
+		t.Fatalf("fail to decode field `int`. [e:%v]", err)
+	}
+
+	if intValue != 1234 {
+		t.Fatalf("unexpected int value. [expect:1234] [actual:%v]", intValue)
+	}
+
+	err = res.DecodeField("string", &strValue)
+
+	if err != nil {
+		t.Fatalf("fail to decode field `string`. [e:%v]", err)
+	}
+
+	if strValue != "1234" {
+		t.Fatalf("unexpected string value. [expect:1234] [actual:%v]", strValue)
+	}
+
+	err = res.DecodeField("float", &floatValue)
+
+	if err != nil {
+		t.Fatalf("fail to decode field `float`. [e:%v]", err)
+	}
+
+	if floatValue != 1234 {
+		t.Fatalf("unexpected float value. [expect:1234] [actual:%v]", floatValue)
+	}
+}

session.go

@@ -13,6 +13,7 @@ import (
 	"crypto/sha256"
 	"encoding/base64"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
@@ -562,7 +563,9 @@ func (session *Session) sendOauthRequest(uri string, params Params) (Result, err
 		res := Result{}
 
 		for k := range query {
-			res[k] = query.Get(k)
+			// json.Number is an alias of string and can be decoded as a string or number.
+			// therefore, it's safe to convert all query values to this type for all purpose.
+			res[k] = json.Number(query.Get(k))
 		}
 
 		return res, nil