Use templates for lots of conversions to SCM and back
This is at the current point of time more or less a fat proof of concept: I've converted stuff by hand more or less until out of steam. But it's probably obvious where this is leading.
Of course it is somewhat ironic that this automatism it now getting introduced when most type conversion warnings have manually been cleared out: obviously it is good for avoiding a fair number of them particularly when converting to Scheme.