﻿``` ss := ["A", "B", null];
``` bqs := [true, false, null];
``` bq := TakeOne([ true ], [else] null);
``` i4qs := [3i4, -17i4, null];
``` i4q := TakeOne([ 12i4 ], [else] null);

ss ?? "hello"
ss ?? null

bqs ?? true
bqs ?? false
bqs ?? bq

i4qs ?? -1i4
i4qs ?? i4q
i4qs ?? null

i4qs + i4qs ?? -1i4
