xsd.exe does not handle default values for xs:decimal correctly

[Stefan Tauner]

when xsd.exe is used with the /c switch to generate c# code from an existing xml schema (.xsd), it handles attributes like the following incorrectly:
<xs:attribute name="setup" type="xs:decimal" default="123"/>

this will generate:
[System.ComponentModel.DefaultValue(123m)]
        [System.Xml.Serialization.XmlAttributeAttribute(Namespace="")]
        public decimal setup {
            get {
                return this.setupField;
            }
            set {
                this.setupField = value;
            }
        }

the important thing is the parameter for the DefaultValue constructor: '123m' is added without quotes. i am not entirely sure that it should actually be quoted, but if it is not then the compiler bails out with:
error CS0182: An attribute argument must be a constant expression, typeof expression or array creation expression
defaults for other types (e.g. integer) are quoted correctly.

this is with the latest mono stuff from 12.04
i.e. 2.10.8.1-1ubuntu1