> Lily uses reference counting for memory management with garbage collection as a fallback. I'd just call this GC where it's rc + (presumably) a tracing GC. >

> Lily uses reference counting for memory management with garbage collection as a fallback. I'd just call this GC where it's rc + (presumably) a tracing GC. > .reject(|r| r.is_space() ) This is nice. I've always found "filter" to be a confusing name. Filter in? Filter out? 'reject' is a very clear name - if it is a space, reject it. Code looks really reasonable. I find `: {` to be a strange idiom. Why not one or the other? Seems to distinguish between single vs multiline? I guess that's reasonable. A bit noisy.