Handle nil-or-boolean arguments in popen kwargs - #9626
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C API equivalent: rb_bool_expected
Three popen/spawn kwargs require either nil or Boolean, rejecting other "truthy" values: unsetenv_others, close_others, and exception. Not erroring here led to unexpected exec during specs, sometimes breaking the spec run. Fixes jruby#9609
This was referenced Sep 1, 2026
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Three popen/spawn kwargs require either nil or Boolean, rejecting other "truthy" values: unsetenv_others, close_others, and exception. Not erroring here led to unexpected exec during specs, sometimes breaking the spec run.
This is part of fixes for #9609, but that involves Process.exec which is not yet hooked up to this ported logic. A separate PR will be started to make that connection.