cfunction
(os/arch)
Check the ISA that janet was compiled for. Returns one of:
:x86 :x86-64 :arm :aarch64 :sparc :wasm :unknown
# on a Core i5-4590:
(os/arch) # => :x64
# on an Intel Atom N270:
(os/arch) # => :x86
# on a raspberry pi:
(os/arch) # => :arm