-- in.cue --
eql: null == null
neq: null != null
unf: null & null

// errors
eq1:  null == 1
eq2:  1 == null
ne1:  "s" != null
call: null()
-- out/compile --
--- in.cue
{
  eql: (null == null)
  neq: (null != null)
  unf: (null & null)
  eq1: (null == 1)
  eq2: (1 == null)
  ne1: ("s" != null)
  call: null()
}
