class Sus::Output::Backtrace

def filter(root: @root, limit: @limit)
	if root
		if limit
			return @stack.lazy.select do |frame|
				frame.path.start_with?(root)
			end.first(limit)
		else
			return up_to_and_matching(@stack) do |frame|
				frame.path.start_with?(root)
			end
		end
	elsif limit
		return @stack.first(limit)
	else
		return @stack
	end
end