make sure symbols are used for internal lookup of timezone ids

Author: Johan Brichau

repository/ZTimestamp.package/ZTimezone.class/class/id..st

@@ -1,8 +1,9 @@
 instance creation
 id: id
 	"Return the timezone identified by id, either from cache or loading it if necessary"
-	
-	id = #GMT ifTrue: [ ^ self gmt ].
+	|idSymbol|
+	idSymbol := id asSymbol.
+	idSymbol = #GMT ifTrue: [ ^ self gmt ].
 	^ self timezones
-		at: id
-		ifAbsentPut: [ self readTimezoneWithId: id ]
+		at:idSymbol
+		ifAbsentPut: [ self readTimezoneWithId: idSymbol ]

repository/ZTimestamp.package/ZTimezone.class/methodProperties.json

@@ -9,7 +9,7 @@
 		"fromFile:" : "JohanBrichau 06/15/2014 15:16",
 		"fromStream:" : "SvenVanCaekenberghe 3/12/2014 11:24",
 		"gmt" : "SvenVanCaekenberghe 3/12/2014 11:24",
-		"id:" : "JohanBrichau 06/15/2014 15:30",
+		"id:" : "JohanBrichau 06/16/2014 22:13",
 		"locationForId:" : "JohanBrichau 06/15/2014 15:20",
 		"readHeaderFrom:" : "SvenVanCaekenberghe 3/10/2014 23:53",
 		"readTimezoneWithId:" : "SvenVanCaekenberghe 3/12/2014 14:15",