Am I missing something?

The doc does not seem to specify the precedence of an unary + or -
  http://www.freepascal.org/docs-html/ref/refch12.html

those operators are only listed in the group "adding operators" (which I would assume to refer to their binary use)

And
Remark: The exponentiation operator (**) is available for overloading,
but is not defined on any of the standard Pascal types (floats and/or
integers)
But ** is not listed in the precedence tables either

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