olemus
tüübivahetus, mis asendab mingi andmetüübi ta ülatüübiga
Wiktionary:
6. (computing) a cast from subtype to supertype

näiteid
https://www.edureka.co/blog/upcasting-and-downcasting-in-java/
https://atheeralzahrani.medium.com/type-casting-what-is-up-casting-and-down-casting-in-swift-d66bae61b97b
https://www.faceprep.in/c-plus-plus/upcasting-and-downcasting-in-cpp/

vt ka
- tüübi allavahetus