On 17/07/2013 19:27, Joel C. Salomon wrote: > Joseph Wright <joseph.wright@...> writes: >> At present I'm waiting to see what people thing of the code-level stuff. >> At the same time, I'm not sure about making package option processing >> too complex. The lesson I've learned is that keyval in options is >> governed by the LaTeX2e kernel: options are expanded, and checking for >> clashes doesn't 'know' about keyval. Thus I tend to think load-time >> options should really be limited to things that need to happen there, >> with later \<thing>setup to cover more complex option sets. > > Is the behavior of package & class options expected to be different > (specifically, keyval-aware) in a LaTeX3 kernel? If so, would it be > appropriate to define \UseExplPackage et al. so that the future behavior can > be experimented with? > > --Joel Not really worthwhile. The way that the LaTeX2e kernel does option processing means that expansion/space stripping happens 'early'. As such, you can't alter it in a way that is easy. Look at the option keyval-patching code in xkeyval and kvoptions to see this: you have to pre-load an additional package before the one where you want 'new' effects. Until we actually have the basics of a new format, this isn't going to help. -- Joseph Wright