FLX-3003: value cannot be rendered as its declared logical type
Family: seam/conformance (the 3000 band)
The seam renders each of KERNEL-SPEC §9's eight logical types from a closed set of Python value classes, so a stream's spelling is a function of the declaration alone. A value of another class -- or one outside the declared type's domain, such as a decimal too large for its declared precision -- is refused. The diagnostic names the column, the row index and the value's class, never the value.
Look it up offline
$ fluxsim explain FLX-3003
Every code is listed in the error index.