D. R. Evans wrote:

It's my understanding that at some point luatex is intended to be a drop-in replacement for pdftex.

I wonder if development has reached the stage yet where developers want to be informed about incompatibilities (i.e., it's at the point where an incompatibility with pdftex is a bug) or whether it's still too early for that?

we're always interested in aspects of luatex where it differs from pdftex but keep in mind that drop-in is not the same as 'compatible'; to mention a few aspects: - wide fonts with more granularity in metric values - a slightly different hyphenation algorithm also with no 256 char limitation - occasional different log messages - an optimized backend - a couple of extensions in the math engine (should remain compatible) also, directional typesetting is currently under reconstruction so that's not yet final of course some aspects of the luatex machinery are 'work in progress and can have bugs (as we find out occasionally) but anyway, interesting differences are welcome, but of course only with small (!) test files Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------