Number of source files checked in output is misleading with -m specifiers

Bug Report

I had a test directory with several files in it. When I switched from mypy test/ to mypy -m test, I found that the output at the result became a bit misleading:

-Found 80 errors in 2 files (checked 32 source files)
+Found 80 errors in 2 files (checked 3 source files)

To Reproduce

mkdir test
touch test/__init__.py test/a.py test/b.py
mypy test/
mypy -m test

Expected Behavior

I would expect the same output in both cases.
There are probably alternate acceptable behaviors - but this one is confusing.

Your Environment

• Mypy version used: .990

Inizia eseguendo la riproduzione segnalata con mypy test/ e mypy -m test usando i comandi elencati. Traccia come vengono conteggiati i file sorgente per gli argomenti directory rispetto agli argomenti modulo, quindi rendi coerente il riepilogo risultante e verifica che entrambi i comandi riportino lo stesso numero di file sorgente controllati.