int to size_t conversion
pair functions must use size_t for index, not int
refine description of pic_get_args
add 'k' specifier to pic_get_args format
use k format specifier in blob.c
use k format specifier in vector.c
use k format specifier in pair.c
use k format specifier in string.c
add pic_size_value
use k format specifier in port.c
avoid explicit casts if possible (small refacotring on dict.c, system.c)
more fix
refactor map and for-each
revert: argc must be size_t type
more fixes