`obj_print*()` gain max argument

[krlmlr]

This argument is also accepted by base::print(), but undocumented.

Closes #1355.

[DavisVaughan]

also accepted by base::print(), but undocumented.

max is actually documented in ?print.default, if that is what you were referring to

[lionel-]

I don't understand why we don't slice in the generic?

[krlmlr]

@lionel-: IIRC, to slice in the generic, we would have to pass both the sliced vector and the original lengths to the detail methods. Do you prefer this solution?

[lionel-]

Don't we pass the whole vector?

[krlmlr]

Yes, right now we pass the whole vector.

Are you proposing the following logic:

• we slice in the generic
• the methods only ever see a truncated version of the vector
• obj_print_footer() is no longer responsible for printing the informative line
• the generic prints the informative line after all methods have been called

?

I rather like that.

[lionel-]

yup exactly