Treat Fraction as a real value in mixed arithmetic operations with complex

[serhiy-storchaka]

In arithmetic operations, if one of operands is a Fraction, and the other operand is a complex or a numbers.Complex, the fraction is implicitly converted to a complex. Third-party types implementing the numbers.Complex interface can distinguish between real and complex operands. In future we can support the mixed real-complex arithmetic also for the builtin complex type. A fraction is a real value, so it makes sense to convert it to float instead of complex in such cases.

Linked PRs

• gh-119838: Treat Fraction as a real value in mixed arithmetic operations with complex #119839

[skirpichev]

In future we can support the mixed real-complex arithmetic also for the builtin complex type.

Then this change will make sense. Right now it contradicts to coercion rules for int/floats op complex.

PS: But thank you for reminding me that I should fix also the "complex op Fraction" case in my pr:)

Edit: After looking on the code, sorry - false alert.

[mdickinson]

A fraction is a real value, so it makes sense to convert it to float instead of complex in such cases.

+1