What's the point of E_ALL | E_STRICT if it's the same value as E_ALL?

• E_ALL equals 8191 (0001 1111 1111 1111)
• E_STRICT equals 2048 (0000 1000 0000 0000)

Using bitwise OR to combine them:

1 1111 1111 1111
  1000 0000 0000

We get the exact same value as the original E_ALL:

1 1111 1111 1111

What's the point of doing error_reporting(E_ALL | E_STRICT) if we can simply do error_reporting(E_ALL) to get the same thing?