see [lscdiag](https://wcjohnson.github.io/lscdiag/?v=1&s=eMOawrVRw4FOw4MwDMO9wpXDjMKnIcKVwqrDk8OUDirCgcKKwrjDswNjQmnDosK2QWlSUkcawqvDusOvJBsHLlRCaMK5JMO2e37DtnMmaMOUwpHCvMODEcOKCcOeej7DhMK7wqp6JC45w7EYwonDtzt5w5LCu8OiMwtnwqvCisOdwqnDicK7LsK3H1DCksOzwphcCD7Cl8O3AcOfRAIdw7sib8Orw65CwpjCkyXCiQlGw6vCncOAw7jDksKjwoAyw4Q9PglSw5bCrG9eDWMpdWhWTMKywodHFmPDhsOkOS04woluw4XDkMK5H8KIwo3DlcOUKcOTwq4DEMOqIcK0w7cqwqoTwq_Cg8OLfcKWbA4JwozCqFEQw4oXK0Nrw6PCtcKOY1rDk8Kow7bDrMOZw7bCg8OSw6jDgjhWwrXDjsO6wqHDmsKmWcKaw50ODiHCgQbDucO3w5LDtlBzw5M-c8Ktw6Eww4_Ci8K7w7jCm8OTf3rDjMKuw6YxaGg1UkzDv8O-wq1LwosIGl9KKcOKw5s#) tl;dr this is broken: ``` someAction() .then! d => d .catch! err => dosomething(err)