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tether.js is not actually relevant to any blacklight_range_limit JS.
Earlier pre-releases of Bootstrap 4 required tether for tooltips. But even before final Bootstrap 4.0, Bootstrap tooltips were no longer using tether, using 'popper.js' instead. twbs/bootstrap#22444
So the generated require tether (and rail gem to provide tether as a sprockets asset) are irrelevant to blacklight_range_limit.
It is not necessary to replace with a "require 'popper'":
Closes #97