When looking for the non-existing 2, FirstPosition returns the default whether or not I specify levelspec:
FirstPosition[{1, 1}, 2, a, Heads -> False]
FirstPosition[{1, 1}, 2, a, {1}, Heads -> False]
a
a
When looking for the non-existing Except[1], FirstPosition returns the default only when I specify levelspec:
FirstPosition[{1, 1}, Except[1], a, Heads -> False]
FirstPosition[{1, 1}, Except[1], a, {1}, Heads -> False]
{}
a
Is it a bug or am I failing to understand Except?
Except[1].{}represents the whole. $\endgroup$