add comment clarifying why the magic dunder is defined as part of methods (as opposed to through a special struct slot)

Author: Matiiss

src_c/color.c

@@ -259,8 +259,17 @@ static PyMethodDef _color_methods[] = {
     {"premul_alpha", (PyCFunction)_premul_alpha, METH_NOARGS,
      DOC_COLOR_PREMULALPHA},
     {"update", (PyCFunction)_color_update, METH_FASTCALL, DOC_COLOR_UPDATE},
+
+    /**
+     * While object.__bytes__(self) is listed in the Data Model reference (see:
+     * https://docs.python.org/3/reference/datamodel.html#object.__bytes__) it
+     * does not appear to have a PyTypeObject struct analog (see:
+     * https://docs.python.org/3/c-api/typeobj.html), so we declare it for the
+     * type as any other custom method.
+     */
     {"__bytes__", (PyCFunction)_color_bytes, METH_NOARGS,
      "Get a byte representation of the color"},
+
     {NULL, NULL, 0, NULL}};
 
 /**