    "An instance of [[Float]] representing positive infinity,
     \{#221E}, the result of dividing a positive number by zero.
     Negative infinity, -\{#221E}, the result of dividing a
     negative number by zero, is the additive inverse `-infinity`.

     Note that any floating-point computation that results in a
     positive value too large to be represented as a `Float` is
     \"rounded up\" to `infinity`. Likewise, any floating-point
     computation that yields a negative value whose magnitude is
     too large to be represented as a `Float` is \"rounded down\"
     to `-infinity`."
    shared Float infinity = 1.0/0.0;