DTOSTR_BUF_SIZE

A good size for a buffer to be passed into [func@GLib.

ascii_dtostr]. It is guaranteed to be enough for all output of that function on systems with 64bit IEEE-compatible doubles.

The typical usage would be something like: ```C char buf[G_ASCII_DTOSTR_BUF_SIZE];

fprintf (out, "value=s\n", g_ascii_dtostr (buf, sizeof (buf), value)); ```