Issues with filename consist of only numbers like '123'

[tddschn]

For example, a string like '123' is interpreted as a Int by map, even if it's also a Path:

$ touch 123
$ ls
123
$ ls | map filesize
[functools error] Incompatible input type: expected 'Path', got 'Int'

[sharkdp]

Please see #19 and #37.