Existing strscan releases rely on this C API. It means that the current Ruby master doesn't work if your Gemfile.lock has strscan unless it's locked to 3.0.7, which is not released yet. To fix it, let's not remove the C API we've exposed to users.
IO#pread
IO#pwrite
struct rb_io
Regexp#dup
Regexp.new(/RE/)
init_int32
rb_random_interface_t
DECIMAL_SIZE_OF
DECIMAL_SIZE_OF_BYTES
read
write
pread
pwrite