Random: show method for MersenneTwister: invalidation resistance (#57913)

Avoid using or constructing the vector with nonconcrete element type.

Should make the sysimage more resistant to method invalidation.

Author: nsajko

stdlib/Random/src/RNGs.jl

@@ -147,21 +147,26 @@ function show(io::IO, rng::MersenneTwister)
     end
     print(io, MersenneTwister, "(", repr(rng.seed), ", (")
     # state
-    adv = Integer[rng.adv_jump, rng.adv]
+    sep = ", "
+    show(io, rng.adv_jump)
+    print(io, sep)
+    show(io, rng.adv)
     if rng.adv_vals != -1 || rng.adv_ints != -1
-        if rng.adv_vals == -1
-            @assert rng.idxF == MT_CACHE_F
-            push!(adv, 0, 0) # "(0, 0)" is nicer on the eyes than (-1, 1002)
-        else
-            push!(adv, rng.adv_vals, rng.idxF)
-        end
+        # "(0, 0)" is nicer on the eyes than (-1, 1002)
+        s = rng.adv_vals != -1
+        print(io, sep)
+        show(io, s ? rng.adv_vals : zero(rng.adv_vals))
+        print(io, sep)
+        show(io, s ? rng.idxF : zero(rng.idxF))
     end
     if rng.adv_ints != -1
         idxI = (length(rng.ints)*16 - rng.idxI) / 8 # 8 represents one Int64
         idxI = Int(idxI) # idxI should always be an integer when using public APIs
-        push!(adv, rng.adv_ints, idxI)
+        print(io, sep)
+        show(io, rng.adv_ints)
+        print(io, sep)
+        show(io, idxI)
     end
-    join(io, adv, ", ")
     print(io, "))")
 end