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…s with nthreads > 1
The `everywhere({}, envir)` call was passing an R environment object to
mirai daemons, which is problematic for two reasons:
1. `envir <- environment()` created a self-referential circular reference
in the local scope (the variable points to the same environment it lives
in). When mirai/nanonext serializes the `run_assignment_core` closure
for transmission to daemon workers, this circular reference causes
serialization failures in newer versions of R/nanonext.
2. `everywhere({}, envir)` did not do what was intended — in mirai 2.x,
the R environment object was passed as an unnamed `...` argument but
was silently ignored by the empty `{}` expression. Serializing a full
R environment for cross-process transmission is inherently fragile.
The `run_assignment_core` closures already capture all required data
(g, cost, from, to, dmat, etc.) from their enclosing scope via normal
R closure semantics. mirai correctly serializes these closures, so the
`everywhere` setup step is unnecessary.
Fixes #69
Co-authored-by: Sebastian Krantz <[email protected]>
Claude/issue 69 20260321 1742
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