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9.6. What an Implementation is Allowed to “Ignore”

In order to make the REXX language implementable on as many
machines as possible, the REXX standard allow implementation to
ignore certain features. The existence of these features are
recommended, but not required. These features are:

[Floating point numbers]
     Are not required; integers will suffice. If floating points
     are not supported, numbers can have not fractional or
     exponential part. And the normal division will not be
     available, i.e. the operator “/” will not be present. Use
     integer division instead.

[File operations]
     Are defined in REXX, but an implementation seems to be
     allowed to differ in just about any file operation feature.