[OFBiz] Users - odd freemarker bug with EditProductInventoryItems.ftl

[Si Chen]

Hi everyone -

Found an odd freemarker bug with EditProductInventoryItems.ftl.  For 
some items, I am getting:

    Error: Expected hash. totalAvailableToPromise?string evaluated 
instead to freemarker.core.BuiltIn$stringBI$BooleanFormatter on line 55, 
column 82 in repository:pages:///product/EditProductInventoryItems.ftl.

which can be traced to a line that has
${totalAvailableToPromise?string.number}

It works fine as ${totalAvailableToPromise?string} or just 
${totalAvailableToPromise}, and I don't see anything unusual about the 
number (the number is 516.)  What does the ".number" after "?string" do, 
that it may be causing this bug?

Thanks,

Si