I found when insert a new record,if it cause overflow, insert operation invokes balance_quick(),in balance_quick()，it create a new leaf page,contain the overflow cell,make it to the right most leaf page of tree.

The right most leaf page only contain 1 cell(overflow cell),does sqlite still treat it as a b+tree page ? in my idea, m-way b-tree cell count is in (m/2-1,m-1)。

I find database file header only has 'Min leaf payload fraction' but no 'Max leaf payload fraction'.