Use DBL_MIN instead of DBL_EPSILON for Num.smallest.

doc/site/modules/core/num.markdown

@@ -15,11 +15,11 @@ The value of π.
 
 ### Num.**largest**
 
-The highest representable value of `Num`.
+The largest representable numeric value.
 
 ### Num.**smallest**
 
-The difference between 1.0 and the next representable value for `Num`.
+The smallest positive representable numeric value.
 
 ## Methods
 

src/vm/wren_core.c

@@ -691,7 +691,7 @@ DEF_PRIMITIVE(num_largest)
 
 DEF_PRIMITIVE(num_smallest)
 {
-  RETURN_NUM(DBL_EPSILON);
+  RETURN_NUM(DBL_MIN);
 }
 
 DEF_PRIMITIVE(num_toString)

test/core/number/largest.wren

@@ -0,0 +1 @@
+System.print(Num.largest) // expect: 1.7976931348623e+308

test/core/number/smallest.wren

@@ -0,0 +1 @@
+System.print(Num.smallest) // expect: 2.2250738585072e-308