Folks,

I just noticed a hiccup when updating a 3.1a image that had my Units 
package from <http://home.netsurf.de/helge.horch/squeak/units.html> 
loaded:  You may get a MessageNotUnderstood (FloatArray>>isZero) during 
file-in of changeset #4248.

Attached is a small patch that helps over the bump; it's basically

ArrayedCollection>>isZero
    ^false

It happens because Units.cs modified Float>>/ to ask #isZero instead of 
comparing against 0, so that unit arithmetic works.  The patch will be 
integrated into further releases of Units.cs.

Cheers,
Helge
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