A non-allocating alternative to the standard Option type.
module type S = Immediate_option_intf.S
Always immediate.
module type S_int63 = Immediate_option_intf.S_int63
Immediate only on 64-bit machines with portable_int63 = false.
portable_int63 = false
module type S_without_immediate = Immediate_option_intf.S_without_immediate
Never immediate.