Fourth Draft "Unsafe fp optimizations" project description.

[dewar@gnat.com]

<<doing something like if (blah_justcomputed == thevalue) could result into a lot
of wasted time.
>>

Misusing any feature can result in a lot of wasted time.

If you are talking about a beginner who thinks that floating-point arithmetic
is real arithmetic, then you had better give warnings like

"warning: this operation is floating-point not real aritmetic"

for every fpt operation :-)