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real BigDecimal type (bigdec, M literals)

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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.
This commit is contained in:
Yogthos 2026-06-22 00:01:01 -04:00
parent 7db5fabc8d
commit ab96650fbb
10 changed files with 288 additions and 191 deletions
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5
host/chez/rt.ss
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@ -347,3 +347,8 @@
;; thread macros, def-var!'d into clojure.core.async. After concurrency.ss (reuses
;; ms->duration) and the collection/seq layer.
(load "host/chez/async.ss")
;; BigDecimal (jolt-i2jm): the jbigdec value type + bigdec/decimal?/class/equality/
;; printing. Loads LAST so its set!-wraps of jolt-class/jolt=2/the printers sit
;; outermost over every earlier extension.
(load "host/chez/bigdec.ss")