[Bug-apl] ⎕FIO[49] introduced a complete change of other ⎕FIO[] syntax

[Christian Robert]

      ⊣⎕FIO[4]fd
DOMAIN ERROR
      ⊣⎕FIO[4]fd
      ^       ^
      fd
6

      ⊣ ⊢⎕FIO[4]fd
DOMAIN ERROR
      ⊣⊢⎕FIO[4]fd
       ^       ^
      ⎕FIO[4]fd
0

how do I silence the result of ⎕FIO[4] ?

Xtian.