Fix SLeaf.default() method returning strings

Original method was returning string value only even in case default
value was eg. integer. Fixed method returns correct data type.

Author: Pepa Hajek

libyang/schema.py

@@ -1047,17 +1047,17 @@ def __init__(self, context: "libyang.Context", cdata):
         self.cdata_leaf = ffi.cast("struct lysc_node_leaf *", cdata)
         self.cdata_leaf_parsed = ffi.cast("struct lysp_node_leaf *", self.cdata_parsed)
 
-    def default(self) -> Optional[str]:
+    def default(self) -> Union[None, bool, int, str]:
         if not self.cdata_leaf.dflt:
             return None
         val = lib.lyd_value_get_canonical(self.context.cdata, self.cdata_leaf.dflt)
         if not val:
             return None
         val = c2str(val)
-        val_type = self.cdata_leaf.dflt.realtype
-        if val_type == Type.BOOL:
+        val_type = Type(self.context, self.cdata_leaf.dflt.realtype, None)
+        if val_type.base() == Type.BOOL:
             return val == "true"
-        if val_type in Type.NUM_TYPES:
+        if val_type.base() in Type.NUM_TYPES:
             return int(val)
         return val