Make static f_format function take a non-frozen string to append
to.
This does not result in an additional allocation for #inspect,
but it does result in an additional allocation for #to_s.
Fixes [Bug #20337]
Previously it would bypass the `FL_ABLE` check, but
since shapes introduction, it started having a different
behavior than `OBJ_FREEZE`, as it would onyl set the `FL_FREEZE`
flag, but not update the shape.
I have no indication of this causing a bug yet, but it seems
like a trap waiting to happen.
This `st_table` is used to both mark and pin classes
defined from the C API. But `vm->mark_object_ary` already
does both much more efficiently.
Currently a Ruby process starts with 252 rooted classes,
which uses `7224B` in an `st_table` or `2016B` in an `RArray`.
So a baseline of 5kB saved, but since `mark_object_ary` is
preallocated with `1024` slots but only use `405` of them,
it's a net `7kB` save.
`vm->mark_object_ary` is also being refactored.
Prior to this changes, `mark_object_ary` was a regular `RArray`, but
since this allows for references to be moved, it was marked a second
time from `rb_vm_mark()` to pin these objects.
This has the detrimental effect of marking these references on every
minors even though it's a mostly append only list.
But using a custom TypedData we can save from having to mark
all the references on minor GC runs.
Addtionally, immediate values are now ignored and not appended
to `vm->mark_object_ary` as it's just wasted space.
assert does not print the bug report, only the file and line number of
the assertion that failed. RUBY_ASSERT prints the full bug report, which
makes it much easier to debug.
Add a special treatment for when the argument of self is an
integral multiple of 45 degrees.
1i ** (10 ** 100) #=> 1+0i
1i ** (10 ** 100 + 1) #=> 0+1i
(1+1i) ** (10 ** 100) # warning: in a**b, b may be too big
#=> (Infinity+0.0i)
(1+1i) ** (10 ** 100 + 1) # warning: in a**b, b may be too big
#=> (Infinity+Infinity*i)
