Add integer converter

preserves.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version = "20240312"
+version = "20240422"
 author        = "Emery Hemingway"
 description   = "data model and serialization format"
 license       = "Unlicense"

src/preserves.nim

@@ -335,6 +335,9 @@ template unpreservable*() {.pragma.}
   ## as its native type.
   ## Unpreservability is asserted at runtime.
 
+converter preserve*(i: SomeInteger): Value =
+  Value(kind: pkRegister, register: BiggestInt i)
+
 proc toPreserves*[T](x: T): Value {.gcsafe.} =
   ## Serializes ``x`` to Preserves. Can be customized by defining
   ## ``toPreservesHook(x: T; E: typedesc)`` in the calling scope.