We moved the literals true and false into one tag
type, so we an extra tag for raw pointer types
(light userdata). These can be used from the C API via
janet_wrap_pointer and janet_unwrap_pointer.
If -p flag is not set, we should bail on all three kinds
of errors, not just runtime errors. This includes
parse and compile errors. Before, parse and compile errors
were not properly affected by the :exit parameter to require, which
in turn caused scripts to not bail on parse or compile errors.
Using the new break special form, the loop
macro was cleaned up. Loop bindings are also
able to be used immediately after declaration, so
forms like (loop [x :range [0 10] :while (< x 5)] (print x)) will
now compile correctly.
The break special form can break out of both loops
and functions with an early (nil) return. Mainly useful
for generated code in macros, and should probably be discouraged
in user written code.
Allow overriding functions in the core libray to provide better
functionality on startup. Used to include our getline function in
the repl but use a simpler version in the core library.
Instead of a int32_t as the length argument, use
size_t to match up better with typearray.c and probably
most idiomatic C libraries.
Janet uses int32_t for length internally for consistency, space
efficiency, ability to fit int32_t in double, and various
other reasons.
Typed arrays used size_t in serialization: C APIs will
also often use it, so it makes sense to add first class support
for it rather than assume it will will fint into an integer.
These changes should quiet some visual studio warnings.
Also make some spacing more consistent.
Leave in issues with calling memcpy with size=0. If these
become a problem, will probably add a janet_memcpy as memcpy
is used so much in the code without 0 checks.
