char* to const char*
new_scalar to new_sclara_xxx
new_scalar_sv to new_scalar, new_scalar_pv to new_scalar
remove fetch_array(x, SV*)
new_integer(iv) to new_integr_iv(iv)
version up
add new_double_size()
fix new_double
add get_double_value, set_double_value
cleanup new_logical
cleanup new_integer
add get_integer_value, set_integer_value
cleanup new_complex
cleanup new_character
cleanup pointer
cleanup destructor
fix memory leak
add is_xxx_type