Incorrect/no parentheses added to math expressions to keep order of operations correct

[Gorfiend]

Input source:

Event OnInit()
  int a = 1 + 2 - 3 + 4
  int b = (1 + 2) - (3 + 4)
  int c = a - (b + 1)
  int d = 1 - (2 + ((3 * 4) / 5))
  int e = 1 - 2 + ((3 * 4) / 5)
EndEvent

Decompiled source:

Event OnInit()
  Int a = 1 + 2 - 3 + 4 ; #DEBUG_LINE_NO:4
  Int b = 1 + 2 - 3 + 4 ; #DEBUG_LINE_NO:5
  Int c = a - b + 1 ; #DEBUG_LINE_NO:6
  Int d = 1 - 2 + 3 * 4 / 5 ; #DEBUG_LINE_NO:7
  Int e = 1 - 2 + 3 * 4 / 5 ; #DEBUG_LINE_NO:8
EndEvent

The decompiler doesn't seem to add any parentheses to keep the order of operations, thus changing the meaning of many math expressions.