[filters] feUnsharpenMask, feDropShadow and drop-shadow

Hi,

Just some notes to the specification text of Filter Effects 1.0.

feDropShadow gives a detailed explanation that it is a shorthand filter effect and how it could be done with existing filter effects from SVG Filters. Maybe feUnsharpenMask can do that as well? [1][2]

Can the drop-shadow explanation just use the shorthand filter effect feDropShadow [3]? In my opinion it doesn't need to describe how it works twice. The sharpen effect uses feUnsharpMask as well.

 <filter id="drop-shadow">
    <feDropShadow stdDeviation="[radius]" flood-color="[color]" dx="[offset-x]" dy="[offset-y]"/>
  </filter> 

Also feDropShadow misses references to 'flood-color' and 'flood-opacity' properties, while feFlood has them [4]. Just step 3 in 'divided into steps' [2] mentions 'flood-color' and 'flood-opacity' without a hint that they should be used for feDropShadow as well.

Greetings
Dirk

[1] https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/publish/Filters.html#feUnsharpMaskElement
[2] https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/publish/Filters.html#feDropShadowElement
[3] https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/publish/Filters.html#dropshadowEquivalent
[4] https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/publish/Filters.html#feFloodElement