Union Schema Transformation and Decoding Compatibility

sanity check -

Schema.union(T1, T2)

Schema.union(T1, T2)

can decode deal with

T1

T1

having a transform that effectively turns it into

T2

T2

? I need to still be able to read the old shape, but can convert it into the new shape for further processing. Later on it's being encoded as

T2

T2

into storage

Union Schema Transformation and Decoding Compatibility - Effect Community