#alt2 cpstr = new FlatBuffer.from(src_s)
#alt3 cpstr = cpstr.substring(1, 5)
-var ns = new NativeString(cpstr.bytelen)
+var ns = new CString(cpstr.byte_length)
ns.fill_from(cpstr)
-print ns.to_s_with_length(cpstr.bytelen)
+print ns.to_s_unsafe(cpstr.byte_length, copy=false)