docs: Add a new 'group by function task.urgency' example

with precision not specified...

Author: claremacrae

docs/Queries/Grouping.md

@@ -663,6 +663,15 @@ group by function task.urgency.toFixed(3)
 
 - Show the urgency to 3 decimal places, unlike the built-in "group by urgency" which uses 2.
 
+```javascript
+group by function task.urgency
+```
+
+- Show non-integer urgency values to 5 decimal places, and integer ones to 0 decimal places.
+- Sorting of groups by name has been found to be unreliable with varying numbers of decimal places.
+- So to ensure consistent sorting, Tasks will round non-integer numbers to a fixed 5 decimal places, returning the value as a string.
+- This still sorts consistently even when some of the group's values are integers.
+
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 ### Recurrence

docs/Scripting/Custom Grouping.md

@@ -193,6 +193,15 @@ group by function task.urgency.toFixed(3)
 
 - Show the urgency to 3 decimal places, unlike the built-in "group by urgency" which uses 2.
 
+```javascript
+group by function task.urgency
+```
+
+- Show non-integer urgency values to 5 decimal places, and integer ones to 0 decimal places.
+- Sorting of groups by name has been found to be unreliable with varying numbers of decimal places.
+- So to ensure consistent sorting, Tasks will round non-integer numbers to a fixed 5 decimal places, returning the value as a string.
+- This still sorts consistently even when some of the group's values are integers.
+
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 ### File property examples