typeinfo minor improvement (#16083)

* typeinfo minor improvement

* minor

* Update lib/core/typeinfo.nim

* rename typeinfo

tests/stdlib/ttypeinfo.nim

@@ -0,0 +1,60 @@
+import typeinfo
+
+type
+  TE = enum
+    blah, blah2
+
+  TestObj = object
+    test, asd: int
+    case test2: TE
+    of blah:
+      help: string
+    else:
+      nil
+
+
+var test = @[0,1,2,3,4]
+var x = toAny(test)
+var y = 78
+x[4] = toAny(y)
+assert x[2].getInt == 2
+
+var test2: tuple[name: string, s: int] = ("test", 56)
+var x2 = toAny(test2)
+var i = 0
+for n, a in fields(x2):
+  case i
+  of 0: assert n == "Field0" and $a.kind == "akString"
+  of 1: assert n == "Field1" and $a.kind == "akInt"
+  else: assert false
+  inc i
+
+var test3: TestObj
+test3.test = 42
+test3 = TestObj(test2: blah2)
+var x3 = toAny(test3)
+i = 0
+for n, a in fields(x3):
+  case i
+  of 0: assert n == "test" and $a.kind == "akInt"
+  of 1: assert n == "asd" and $a.kind == "akInt"
+  of 2: assert n == "test2" and $a.kind == "akEnum"
+  else: assert false
+  inc i
+
+var test4: ref string
+new(test4)
+test4[] = "test"
+var x4 = toAny(test4)
+assert($x4[].kind() == "akString")
+
+block:
+  # gimme a new scope dammit
+  var myarr: array[0..4, array[0..4, string]] = [
+    ["test", "1", "2", "3", "4"], ["test", "1", "2", "3", "4"],
+    ["test", "1", "2", "3", "4"], ["test", "1", "2", "3", "4"],
+    ["test", "1", "2", "3", "4"]]
+  var m = toAny(myArr)
+  for i in 0 .. m.len-1:
+    for j in 0 .. m[i].len-1:
+      doAssert getString(m[i][j]) == myArr[i][j]