Stroke width changes when fill changed

[rickmastfan67]

Inkscape 0.48.4 r9939
Windows 7 x64

Steps to reproduce:
1. Open attached file in a text editor.
2. Go to line 55 and notice the text "stroke-width:1.05".
3. Now, open the file in Inkscape.
4. Select the object.
5. Change the fill color to anything by clicking on any of the colors in the color bar (except red since that's the current color of the fill for the object).
6. Re-save the file.

What happens:
When you re-open the file in the text editor and go back down to line 55, the "stroke-width" is now: 1.05000000000000000

What should happen:
The "stroke-width" shouldn't be changed since you only changed the fill color and never touched the stroke.

For some odd reason, Inkscape is adding fifteen 0's after the "1.05", thus adding 15 completely unnecessary bytes to the file.

[su_v (suv-lp)]

Reproduced with Inkscape 0.48.4 on OS X 10.7.4,
not reproduced with current trunk (r11986).