Hey all, I just noticed some quirky behavior on the Prefect Cloud UI when configuring Inputs on a Flow. I have some boolean Parameters set in the flow, and they appear to display their defaults correctly in the Cloud UI. However, when I try to switch from 

true

 -> 

false

 or vice versa, the UI appears to be converting them under the hood to strings (

"true"

 or 

"false"

 , as the case may be). This causes  conditional logic that checks for “truthiness” in my flow to behave incorrectly (i.e. conditionals expecting a 

False

 always evaluate as 

True

 since non-empty Python strings always evaluate as

True

). I verified this by toggling the values in Inputs UI and switching to the JSON configuration view of the data. I can get the Flow to run correctly by switching to the JSON configuration and correcting the issue, but figured that perhaps I’m missing something basic about the UI. Anyone have advice?

Hi @Serdar Tumgoren, thanks for the very detailed writeup. Will make sure the UI team sees this tomorrow.

@Kevin Kho Sure thing! Also, fwiw, I got things to work by simply not toggling to JSON mode. I haven’t dug into the internals to see what’s actually getting passed to the agent, but it seems that if I update Inputs in the UI and then perform the run, things work as expected. The Run UI displays the

true

and

false

values as proper booleans and my flow works correctly (see image below). So perhaps this is just a quirk related to toggling to JSON configuration mode? Anyhow, sorry to bug you all on the weekend with it. Let me know next week if you have any follow-ups to help reproduce the issue

Hi @Serdar Tumgoren - thanks for the detailed report. This does indeed look like a bug in the toggle logic. I'll open a ticket so the UI team can look into it and get out a patch.

@nicholas Thanks for the speedy response! And love the Marvin-bot 🙂