bug#36649: 27.0.50; pure space and pdumper

[martin rudalics]

>> I think Emacs already assumes Qnil == 0, since there are places that
>> use ! to check for Qnil rather than using NILP.
>
> Those are bugs that need to be fixed.  Fast.

Here this would get me

../../src/window.c: In function ‘select_window’:
../../src/window.c:535:7: error: wrong type argument to unary exclamation mark
   if (!norecord || EQ (norecord, Qmark_for_redisplay))
       ^

or

  CC       window.o
../../src/window.c: In function ‘select_window’:
../../src/window.c:535:17: error: invalid operands to binary == (have 
‘Lisp_Object’ {aka ‘struct Lisp_Object’} and ‘int’)
   if ((norecord == false) || EQ (norecord, Qmark_for_redisplay))
                 ^~

so I cannot imagine that we really had such bugs.  Unless you mean Lisp
variables explicitly defined via DEFVAR_BOOL.

martin