CamelCase words are treated specially: 'NullPointerException' will return work items that contain this exact term, but also others that contain just 'NPE'.
An example of this is in JET's ability to use camelcase in XPath expressions by extending this extension point (see the CamelCaseFunction in the JET source code).
Methods that exist in .NET assemblies are available in IronRuby in two forms: familiar ruby lowercase form (controls.add) and traditional C# camelcase form (ToString).