ab96650fbb
bigdec / 1.5M / 0.0M silently produced doubles. Add a jbigdec value type
{unscaled, scale} over Chez exact integers (host/chez/bigdec.ss): value =
unscaled * 10^-scale. An M-suffix literal reads to a :bigdec form that the back
end lowers to jolt-bigdec-from-string (same IR-leaf path as #inst/#uuid); bigdec
coerces a number/string. Equality is by value (1.0M = 1.00M true, 3M = 3 false),
str drops the M and pr keeps it, class is java.math.BigDecimal, decimal? is true.
Arithmetic contagion isn't modelled (out of scope). The old corpus cases passed
spuriously as doubles; they now exercise a genuine BigDecimal.
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