[ic] Where is the limit defined?

[DB]

This loop works fine:

[loop list="1..5000" ranges=1]
[loop-code]
[/loop]

If I try to iterate up to 5100 however, it fails with this entry in my
error.log:

"Refuse to add 5100 options to option list via range, max 5000."

I'm having trouble finding where this limit of 5000 is defined. Can
anyone provide a clue?

DB