Hi Shahrokh and Miller. I've sent this before, but now I'm sending again with a more explicit subject and also a Pull Request.
I've tested the new expr (v0.55 released in pd 0.48) and I still have some remaining bugs to report. These are bugs I really think should be fixed, and some suggested feature requests.
One of the bugs is plain simple, the fact that fexpr~ doesn't allow a float input in its left inlet. That doesn't seem intentional, by the way, because [expr~] allows it. Anyway, here's a simple Pull Request I created about it, see if it's cool: https://github.com/pure-data/pure-data/pull/219
cheers