According to the text just after TUS 7.0.0 Figure 23-3 (http://www.unicode.org/versions/Unicode7.0.0/ch23.pdf#G25237), ZWJ suppresses ligatures in Arabic script. Does this rule apply to other normally cursive joined scripts, e.g. Syriac and Mongolian?
Am I right in thinking that for an OpenType font for other scripts, the font writer must take precautions to prevent ZWJ accidentally suppressing ligatures that would be better suppressed by ZWNJ or <ZWJ ZWNJ ZWJ>?
