fix: stop FileStream.New(handle) from re-applying the handle's FileMode - #1098

     62 files  ±  0       62 suites  ±0   1h 15m 52s ⏱️ - 4m 16s
 63 618 tests +280   56 742 ✅ +205   6 876 💤 +75  0 ❌ ±0 
147 734 runs  +308  128 670 ✅ +233  19 064 💤 +75  0 ❌ ±0 

Results for commit 01f7707. ± Comparison against earlier commit 07cdd8a.