enabling TaskLocal requires enabling a feature of monix 'enableLocalContextPropagation'.
for non-trivial contracts this causes a stack overflow. https://github.com/rchain/perf-harness/blob/master/contracts/wide_a_setup.rho
some experimentation with the code leads to a conclusion that perhaps this feature just uses more stack (it allocates a ‘WithLocal' object).
a quick fix is to make the stack memory larger (Xss 5m seems to work).
This ticket was created as a reminder that there is this issue (feature?) and it should be analysed further.