Even broader look on this is which run-time properties the resulting _typical_ code has.

Most languages tend to produce a distinct behavior patterns and properties, such as (in no particular order):

- multi-threaded / single-threaded / multi-process

- frequency of memory safety bugs

- broken locale / unicode handling

- broken or non-standard network settings handling

- only synchronous I/O calls (or in contrast only async I/O)

- releasing memory back to OS (or not)

- fragmenting heap over time (or not)

- fast / slow text processing

- fast / slow binary codecs