diff --git a/lib/logitech/unifying_receiver/common.py b/lib/logitech/unifying_receiver/common.py
index 3bf889e3..7afa06bb 100644
--- a/lib/logitech/unifying_receiver/common.py
+++ b/lib/logitech/unifying_receiver/common.py
@@ -11,8 +11,8 @@ from struct import pack as _pack
 class NamedInt(int):
 	"""An reqular Python integer with an attached name.
 
-	Careful when using this, because
-	"""
+	Caution: comparison with strings will also match this NamedInt's name
+	(case-insensitive)."""
 
 	def __new__(cls, value, name):
 		obj = int.__new__(cls, value)
@@ -23,45 +23,18 @@ class NamedInt(int):
 		value = int(self)
 		if value.bit_length() > count * 8:
 			raise ValueError('cannot fit %X into %d bytes' % (value, count))
-
 		return _pack(b'!L', value)[-count:]
 
-	def __hash__(self):
-		return int(self)
-
 	def __eq__(self, other):
+		if isinstance(other, NamedInt):
+			return int(self) == int(other) and self.name == other.name
 		if isinstance(other, int):
 			return int(self) == int(other)
-
 		if isinstance(other, basestring):
 			return self.name.lower() == other.lower()
 
 	def __ne__(self, other):
-		if isinstance(other, int):
-			return int(self) != int(other)
-
-		if isinstance(other, basestring):
-			return self.name.lower() != other.lower()
-
-	def __lt__(self, other):
-		if not isinstance(other, int):
-			raise TypeError('unorderable types: %s < %s' % (type(self), type(other)))
-		return int(self) < int(other)
-
-	def __le__(self, other):
-		if not isinstance(other, int):
-			raise TypeError('unorderable types: %s <= %s' % (type(self), type(other)))
-		return int(self) <= int(other)
-
-	def __gt__(self, other):
-		if not isinstance(other, int):
-			raise TypeError('unorderable types: %s > %s' % (type(self), type(other)))
-		return int(self) > int(other)
-
-	def __ge__(self, other):
-		if not isinstance(other, int):
-			raise TypeError('unorderable types: %s >= %s' % (type(self), type(other)))
-		return int(self) >= int(other)
+		return not self.__eq__(other)
 
 	def __str__(self):
 		return self.name
@@ -72,14 +45,23 @@ class NamedInt(int):
 
 
 class NamedInts(object):
+	"""A collection of NamedInt values.
+
+	Behaves partially like a sorted list (by int value), partially like a dict.
+	"""
 	__slots__ = ['__dict__', '_values', '_indexed', '_fallback']
 
 	def __init__(self, **kwargs):
-		values = dict((k, NamedInt(v, k.lstrip('_') if k == k.upper() else
-										k.replace('__', '/').replace('_', ' '))) for (k, v) in kwargs.items())
+		def _readable_name(n):
+			assert isinstance(n, basestring)
+			if n == n.upper():
+				n.lstrip('_')
+			return n.replace('__', '/').replace('_', ' ')
+
+		values = {k: NamedInt(v, _readable_name(k)) for (k, v) in kwargs.items()}
 		self.__dict__ = values
 		self._values = sorted(list(values.values()))
-		self._indexed = dict((int(v), v) for v in self._values)
+		self._indexed = {int(v): v for v in self._values}
 		self._fallback = None
 
 	def flag_names(self, value):
@@ -102,26 +84,47 @@ class NamedInts(object):
 		if isinstance(index, int):
 			if index in self._indexed:
 				return self._indexed[int(index)]
-
 			if self._fallback and type(index) == int:
 				value = NamedInt(index, self._fallback(index))
 				self._indexed[index] = value
 				self._values = sorted(self._values + [value])
 				return value
 
-		elif type(index) == slice:
+		elif isinstance(index, slice):
 			return self._values[index]
 
+		elif isinstance(index, basestring):
+			if index in self.__dict__:
+				return self.__dict__[index]
+
+	def __setitem__(self, index, name):
+		assert isinstance(index, int)
+		if isinstance(name, NamedInt):
+			assert int(index) == int(name)
+			value = name
+		elif isinstance(name, basestring):
+			value = NamedInt(index, name)
 		else:
-			if index in self._values:
-				index = self._values.index(index)
-				return self._values[index]
+			raise TypeError('name must be a basestring')
+
+		if str(value) in self.__dict__:
+			raise ValueError('%s (%d) already known' % (str(value), int(value)))
+		if int(value) in self._indexed:
+			raise ValueError('%d (%s) already known' % (int(value), str(value)))
+
+		self._values = sorted(self._values + [value])
+		self.__dict__[str(value)] = value
+		self._indexed[int(value)] = value
 
 	def __contains__(self, value):
-		return value in self._values
+		if isinstance(value, int):
+			return int(value) in self._indexed
+		if isinstance(value, basestring):
+			return str(value) in self.__dict__
 
 	def __iter__(self):
-		return iter(sorted(self._values))
+		for v in self._values:
+			yield v
 
 	def __len__(self):
 		return len(self._values)
diff --git a/lib/logitech/unifying_receiver/receiver.py b/lib/logitech/unifying_receiver/receiver.py
index a72bebb8..c59469ac 100644
--- a/lib/logitech/unifying_receiver/receiver.py
+++ b/lib/logitech/unifying_receiver/receiver.py
@@ -6,7 +6,6 @@ from __future__ import absolute_import, division, print_function, unicode_litera
 
 import errno as _errno
 from weakref import proxy as _proxy
-from collections import defaultdict as _defaultdict
 
 from logging import getLogger
 _log = getLogger('LUR').getChild('receiver')
@@ -15,7 +14,7 @@ del getLogger
 from . import base as _base
 from . import hidpp10 as _hidpp10
 from . import hidpp20 as _hidpp20
-from .common import strhex as _strhex
+from .common import strhex as _strhex, NamedInts as _NamedInts
 from .descriptors import DEVICES as _DEVICES
 
 #
@@ -144,7 +143,7 @@ class PairedDevice(object):
 		if self._registers is None:
 			descriptor = _DEVICES.get(self.codename)
 			if descriptor is None or descriptor.registers is None:
-				self._registers = _defaultdict(lambda: None)
+				self._registers = _NamedInts()
 			else:
 				self._registers = descriptor.registers
 		return self._registers