"Why is [1:10...] a puzzle?" Just that a new user might expect to see or use the ellipsis in its conventional position:
[1...10]
rather than at the end:
[1:10...]
"Why is [1:10...] a puzzle?" Just that a new user might expect to see or use the ellipsis in its conventional position:
[1...10]
rather than at the end:
[1:10...]