Strictly capturing non-strict closures.

Zachary J. Sullivan Paul Downen Zena M. Ariola Strictly capturing non-strict closures. 74-89 2021 PEPM@POPL https://doi.org/10.1145/3441296.3441398 conf/pepm/2021 db/conf/pepm/pepm2021.html#SullivanDA21