fix: correct regression w/ PermissionValue accepted values

disco/types/permissions.py

@@ -40,6 +40,9 @@ class PermissionValue(object):
     __slots__ = ['value']
 
     def __init__(self, value=0):
+        if isinstance(value, PermissionValue):
+            value = value.value
+
         self.value = value
 
     def can(self, *perms):

tests/types/permissions.py

@@ -26,3 +26,17 @@ def test_permission_value_mutation():
 
     no_perms.send_messages = True
     assert no_perms.can(Permissions.SEND_MESSAGES)
+
+
+def test_permission_value_accepts_permission_value():
+    perms = PermissionValue(Permissions.ADMINISTRATOR)
+
+    new_perms = PermissionValue(perms)
+    assert new_perms.administrator
+
+    assert not new_perms.manage_channels
+    new_perms.add(PermissionValue(Permissions.MANAGE_CHANNELS))
+    assert new_perms.manage_channels
+
+    new_perms.sub(PermissionValue(Permissions.MANAGE_CHANNELS))
+    assert not new_perms.manage_channels