This is wrong (as discussed before) and is likely the cause of PR21573 (not VRP-related, the expanders for SWITCH_EXPR look at these attributes, too). I'm not sure if it is safe to delete these assignment statmeents because TYPE_MIN_VALUE/TYPE_MAX_VALUE are used quite extensively throught GIGI.
Well, what *should* they be set to? That is indeed setting them to the minimum and maximum values as defined by the language.