I had previously failed to find a web-accessible document demonstrating neatroff's Farsi capabilities, however I have now found one published by neatroff's author, at https://litcave.rudi.ir/neatfarsi.pdf. In addition: I now understand the value of small caps and old-style numerals accessible as OpenType features, and have come to mention an iteration of URW's Garamond No. 8 that does just that.