improved type checking (I hope) Rev: src/Makefile.in:1.171 Rev: src/builtin_functions.c:1.218 Rev: src/constants.c:1.19 Rev: src/constants.h:1.10 Rev: src/las.c:1.135 Rev: src/opcodes.c:1.68 Rev: src/pike_types.c:1.85 Rev: src/pike_types.h:1.28 Rev: src/program.c:1.178 Rev: src/testsuite.in:1.248