Seems a plain vanilla install of bluebream validates decimals fine with zope.app.form. Does z3c.form validate decimal fields or is that delegated to zope.schema?
I have an interface with a decimal field. It validates fine for 1,2 and 3 fractions but if I enter a decimal with 4 fractions I get validation error "The entered value is not a valid decimal literal."
I'm using the pypi release of bluebream and z3c.form 2.3.2.
Mats