PERF: countCycles doesn't respect options.depth

[idbrii]

inspect can be slow with { depth = 1 } on large tables because countCycles still fully processes the whole table.

inspect.lua/inspect.lua

Lines 304 to 314 in 9c8a68d

	local depth = options.depth or (math.huge)
	local newline = options.newline or '\n'
	local indent = options.indent or ' '
	local process = options.process
	if process then
	root = processRecursive(process, root, {}, {})
	end
	local cycles = {}
	countCycles(root, cycles)

cycles is only used to print the id before a table, but if the additional references aren't printed then the id isn't useful. Definitely doesn't seem worth the cost just to indicate that a value is referenced deeper inside the table. I had cases where inspect(t, { depth = 1 }) took 1000 ms but removing countCycles reduced it to 1 ms.

[kikito]

Hello, this could be a good optimisation for inspect. I cannot devote time to implement it right now, feel free to open a pull request