fix!: push & unshift now accept undefined values to match behaviour of Array (fixes #25) (#35)
This is only a BREAKING change if you are currently expecting push(undefined) and unshift(undefined) to do
nothing - the new behaviour now correctly adds undefined values to the queue.
Note: behaviour of push() & unshift() (no arguments) remains unchanged (nothing gets added to the queue).
Note: If you need to differentiate between undefined values in the queue and the return value of pop() then
check the queue .length before popping.
fix: incorrect methods in types definition file
1.5.1
perf: minor performance tweak when growing queue size (#29)
1.5.0
feat: adds capacity option for circular buffers (#27)
