builtin is a module that is implicitly imported by every V program.
It implements the builtin V types array, string, map.
It also includes Unicode-aware string helpers such as string.graphemes()
for splitting text into grapheme clusters.
It also implements builtin functions like println, eprintln, malloc,
panic, print_backtrace.
The autogenerated documentation for builtin functions is lacking, so for these
functions, please refer to the
official V documentation.