rai exec raises JSON marshal error with value types

[staworko]

The following program

value type T = String
def output = ^T["a"]

works under console but when executed with rai exec fails and gives this error message json: cannot unmarshal object into Go struct field RelKey.output.rel_key.values of type string

[billscheidel-rai]

Note: This issue has been migrated to https://relationalai.atlassian.net/browse/RAI-6112.

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