Top data.table issues

[R-Forge #5222] 'not found' when DT[, list(sum(non-.SD-col), lapply(.SD,mean)), by=..., .SDcols=...]

High bug

[R-Forge #5580] invisible functions become visible in the j-expression

bug wontfix

[R-Forge #2298] If the RHS of := is recycled plonk, there's no column copy, tripping up setkey() and more later.

bug