range of elements for decoding is too narrow

as can be seen in this NOTE and this FIXME, the reconstruction of shards currently can't handle less than (k - 1) \rho + 1 nor more than k \rho bytes, where \rho is the curve number of bytes per scalar field element, e.g. 31 for BLS-12-381.

this is obviously not scalable and should be fixed 🤔

errors

• when too few bytes

could not encode shards (62 bytes): IncompatibleMatrixShapes(1, 2, 3, 5)

• when too many bytes

could not build source shard matrix (94 bytes): InvalidMatrixElements("expected rows to be of same length 3, found 1 at row 1")