I came across an edge case tonight:
- converting an existing non-template script to template'd
- yolk fails to process it due to existing sh bits colliding with template next-line tag
- trying to template my way around this fails as it's "not reversible" (fair enough)
(I've worked around this and avoided needing to template this file for now, but in general I think this would still be handy for giving these edge cases an escape hatch)