rainbow is a completely scheme-independent arc implementation. I expect that it's not the 100-year implementation of the 100-year language: arc2c is likely to have seriously superior performance. And I gather that java isn't pg's all-time favourite language. A lot of scheme leaks into the current arc implementation: (is #f nil) is t, #x12 is 18, 'sread reads scheme expressions. Apart from sread, which is destined in a comment to be replaced by writing 'read, it's not obvious whether these should be considered part of the specification.
In the early days, many java libraries were non-java implementations. Gradually they were replaced by "pure java" versions. Is there any reason arc should not do the same?
