Bug in Angle Dimensionality

[rbreslavsky]

I noticed an issue with regards to angle dimensionality. For one, when working with degrees to some exponent, n, pint does not distinguish degrees ** n from degrees. Furthermore, I can convert to degrees from degrees ** n, but this changes the numbers in a way that is obfuscated.

import pint

ureg = pint.UnitRegistry()

test = 5.0 * ureg('deg')
test_squared = test ** 2

Then I get:

In: test_squared
Out: <Quantity(25.0, 'degree ** 2')>

In: test_squared.is_compatible_with('deg')
Out: True

In: test_squared.to('deg')
Out: <Quantity(0.436332313, 'degree')>

The last output has converted <Quantity(25.0, 'degree')> to a radian equivalent, which was not the intent.