Can Photoshop no longer handle decimals in feathering values?

Hi,
I've always appreciated the sensitivity of the feathering in Photoshop, where there was actually a difference between 0.3 and 0.4 px feathering (on the selection lasso, for instance).
However, ever since upgrading to CS5, I've noticed that Photoshop doesn't seem to like decimal feathering. Anything between 0 and 0.4 looks exactly the same, and everything between 0.5 and 1.4 looks the same as well. In other words, Photoshop seems to be rounding it out to the nearest full pixel.
There are situations where I litterally need 0.5 px feathering, but can't get it.
Is this a bug, or am I doing it wrong?
Note : Been using Photoshop since 1997, this is the first time I've encountered this problem.

I can confirm what you're reporting.  I hadn't noticed the difference myself as I rarely use decimal feathering values, but I just tested...
What I did was this:
1.  Make a rectangular selection with 0.4 pixels feathering.  Copy / Paste as a new layer.
2.  Repeat step one on the original at 0.6 pixels, and 1 pixels.
The 0.4 pixel copy has a perfectly hard edge (i.e., there really was no feathering at all).
The 0.6 pixel feathering and 1 pixel feathering copies are identical.
Same results in Photoshop CS4.  I haven't had time to test CS3 or earlier yet.
This surprises me a little, as I believe Chris Cox (of Adobe) worked to actually INCREASE the resolution of many of the functions of Photoshop CS5 - for example you can now specify the rotation of a free transform to the hundredth of a degree instead of just a tenth.
-Noel

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