I was seeing a heisenbug-ish incompatibility with DataFrames.jl:
https://github.com/ITensor/ITensors.jl/issues/437. Unclear what was
going on: could be a bug (/ bad behavior) in DataFrames.jl or in
Julia's method-dispatch code (saw in v1.4.2). This change more tightly
specifies the method, working around the problem.
I was seeing a heisenbug-ish incompatibility with DataFrames.jl: https://github.com/ITensor/ITensors.jl/issues/437. Unclear what was going on: could be a bug (/ bad behavior) in DataFrames.jl or in Julia's method-dispatch code (saw in v1.4.2). This change more tightly specifies the method, working around the problem.