What does the blue ⓘ prefix indicate in otherwise-valid binding previews?
That's interesting. It seems to indicate that you have > 12 characters in your string (inside the ' 's). Delete any character and it goes away!
Update:
Hovering over the ⓘ gives a tooltip showing the whole result instead of the truncated version.
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i’ve been wondering about this for literally years and never bothered to hover over the ⓘ instead of the string
Update: no bueno. guessing you didn’t know about the hover-over-string trick?
ah - you pushed me in the right direction - I think it’s a hint that the entire preview can’t be shown in-place, and perhaps an attempt to beckon a hover/surface the tooltip UX feature. Perhaps we’re saying the same thing? Though you’d think the … suffix would serve the same purpose. That was anticlimactic.
I can’t believe I expected the tooltip to be unbounded for a moment there 
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Well, we wish it showed the whole result, but it's truncated still after a max length... I've got a feature request somewhere to give a better text field where the whole thing is visible to be able to copy as well
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I’ve seen those 
In case it’s not obvious: can just bind to a dummy prop and iterate with judiciously placed/commented return value or {value} lines, multiple chained transforms, and frequent use of the ‘apply’ button. Easy enough to right click > copy on properties if necessary (and they format nicely as json/datasets with the table view)
I usually have several chained transforms while developing/debugging, then put it all in one and right-click > copy binding (on dummy prop), then right-click > paste binding (on desired prop) when I’m done.
and of course delete the dummy prop!
for a fun time, copy a dataset property and paste it into a code editor/notepad!