I learned that Clojure reader interprets decimal literal with suffix 'M', 
like 1.23M, as BigDecimal. And I also know that decimal numbers with no 'M' 
become Java double.
But I think it would be better that normal decimal number is BigDecimal, 
and host-dependent decimal has suffix, like 1.23H. So when the number is 
corrupted or truncated because of the precision limit of IEEE double, we 
can easily notice that the number is precision-limited. Also, I think 
easier expression should be host-independent.

Is there any reason that Clojure interprets literal decimal as Java double, 
other than time performance? Also, I don't think time performance is an 
answer, because it's not C/C++, and other way to declare host-dependent 
decimal can be implemented just like '1.23H'.

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