Is plural supposed to expand any expressions at all.

I thought it was supposed to work {{plural:<some number>|foo|bar}} and if the number needs to be modded 10 in the content laguage, the software will do it.

For example in russian (This is my understanding. could be wrong)
{{plural:1|foo|bar|baz}} = {{plural:21|foo|bar|baz}} = foo

{{plural:2|foo|bar|baz}} = {{plural:3|foo|bar|baz}} = bar

{{plural:0|foo|bar|baz}} = {{plural:5|foo|bar|baz}} = baz

(I'll leave this open in case i totally misunderstood how plural works and just made a fool of myself)

I think to really answer this, we'd have to have someone test the output of

{{plural:1*2|is|are}} and {{plural:2*1|is|are}}

Otherwise, it just looks to me like 1*1 in Martin's original post is not being expanded at all.