font-feature-settings W3C CSS Validator Error

The W3C CSS Validation Service wrongly reports:
> normal is not a font-feature-settings value : normal

while the CSS Fonts Module Level 3 W3C Candidate Recommendation 3
October 2013 clearly states that
(<http://www.w3.org/TR/css-fonts-3/#font-feature-settings-prop>):
> Name: 	font-feature-settings
> Value: 	normal | <feature-tag-value> #
> Initial: 	normal

this is further reinforced with:
> A value of ‘normal’ means that no change in glyph selection or
positioning occurs due to this property.

Clearly ‘normal’ /is/ a font-feature-settings value and that this must
be a bug in the validation service.

Note: I checked the bug list for CSSValidator and failed to find any
bugs relating to font-feature-settings.

Regards,
Tom Thorogood.