Flow: [Question] Using disjoint unions

[sgb-io]

Reproduced example: https://flow.org/try/#0PTAEAEDMBsHsHcBQAXAngBwKagMrIIbLYC8oA3oqKANTIAWAlgHYDmAzgFygCCATr-lQAeCgEhR1JvgC2mLm2S9mLADSUqGqtQDGsAK5NkXJnukAjTLzWgAvgD5ENgNyJEupgtwBRACoB9ADluAFkvUFIAchxfQJCvCLdYD2RvfwBhAHkAVQCfcNAomMycnwSUDGwcTGQAmRJyUDQsLibMWEhU2NCVUClZeUVlWxdW3Gq0-UN8skaKlor2zuLcnt0DI17TC15h11HubWQGJPyqmrrQAB8x5An1l0RIA0PjplBeTAATPW1LAAoFIQ5LgCEQevgXkkuAcjkkAJRcPBA8jqNjwBjIbR0UB-CGwpgAOlacJRmm0+DYlRiQVCHHUmg+yD0vDeFE0mgJnMBYPp7Poyk4oG5mCJjFYbAJ0nw6D+f35rBJxDspPZVFEjOZrN5mnEnNFymsqqNVD6wLxrwJpu1oHENmtohscOtzlconJlKW2VydNVGpZKtVeuFhtV8vYAyB+vFkulsrDiuVbKN6uqmoD7N1nLDIeN7LWhi45qSBPzyHtDvtjudD00n0wkHwemgRlE1r9b2FLiodpsQA

Having read the documentation and read similar issues, I am unclear how to correctly use disjoint unions in the simple example above.

Is anyone able to point me in the right direction here?

[AugustinLF]

The problem is actually not with the union, but with your map call which invalidates the refinement. Pulling count/name before the call to map works. Here is a working example.

[wchargin]

@AugustinLF is correct. Here are the [docs on refinement invalidations].
Here is a [fixed example] of your code.

[sgb-io]

Thanks @AugustinLF @wchargin