A facility for writing functions that quote their arguments, may sometimes evaluate them in the environment where they were quoted, and may pass them as quoted to other functions.
Version 0.1.3, 2019-04-22:
More caution with PROTECT.
Version 0.1.2, 2018-03-26:
Re-introduced two small changes to error checking accidently reverted in 0.1.1.
Version 0.1.1, 2018-01-08:
Small changes for compatibility with new R Core REFCNT scheme, and for more caution with PROTECT.
Version 0.1.0, 2017-06-18: