diff --git a/spec/cbor/lexer_spec.cr b/spec/cbor/lexer_spec.cr
index 80edc10..cd42687 100644
--- a/spec/cbor/lexer_spec.cr
+++ b/spec/cbor/lexer_spec.cr
@@ -3,24 +3,88 @@ require "../spec_helper"
 describe CBOR::Lexer do
   describe "examples from the RFC7049 Appendix A" do
     tests = [
-      {"0", "00"},
-      {"1", "01"},
-      {"10", "0a"},
-      {"23", "17"},
-      {"24", "18 18"},
-      {"25", "18 19"},
-      {"100", "18 64"},
-      {"1000", "19 03 e8"},
-      {"1000000", "1a 00 0f 42 40"},
-      {"1000000000000", "1b 00 00 00 e8 d4 a5 10 00"},
-      {"18446744073709551615", "1b ff ff ff ff ff ff ff ff"},
-      # {"18446744073709551616", "c2 49 01 00 00 00 00 00 00 00 00"},
-      {"-18446744073709551616", "3b ff ff ff ff ff ff ff ff"},
-      # {"-18446744073709551617", "c3 49 01 00 00 00 00 00 00 00 00"},
-      {"-1", "20"},
-      {"-10", "29"},
-      {"-100", "38 63"},
-      {"-1000", "39 03 e7"},
+      { %(0), "00" },
+      { %(1), "01" },
+      { %(10), "0a" },
+      { %(23), "17" },
+      { %(24), "18 18" },
+      { %(25), "18 19" },
+      { %(100), "18 64" },
+      { %(1000), "19 03 e8" },
+      { %(1000000), "1a 00 0f 42 40" },
+      { %(1000000000000), "1b 00 00 00 e8 d4 a5 10 00" },
+      { %(18446744073709551615), "1b ff ff ff ff ff ff ff ff" },
+      # { %(18446744073709551616), "c2 49 01 00 00 00 00 00 00 00 00"},
+      { %(-18446744073709551616), "3b ff ff ff ff ff ff ff ff" },
+      # { %(-18446744073709551617), "c3 49 01 00 00 00 00 00 00 00 00"},
+      { %(-1), "20" },
+      { %(-10), "29" },
+      { %(-100), "38 63" },
+      { %(-1000), "39 03 e7" },
+      # { %(0.0), "f9 00 00"},
+      # { %(-0.0), "f9 80 00"},
+      # { %(1.0), "f9 3c 00"},
+      # { %(1.1), "fb 3f f1 99 99 99 99 99 9a"},
+      # { %(1.5), "f9 3e 00"},
+      # { %(65504.0), "f9 7b ff"},
+      # { %(100000.0), "fa 47 c3 50 00"},
+      # { %(3.4028234663852886e+38), "fa 7f 7f ff ff"},
+      # { %(1.0e+300), "fb 7e 37 e4 3c 88 00 75 9c"},
+      # { %(5.960464477539063e-8), "f9 00 01"},
+      # { %(0.00006103515625), "f9 04 00"},
+      # { %(-4.0), "f9 c4 00"},
+      # { %(-4.1), "fb c0 10 66 66 66 66 66 66"},
+      # { %(Infinity), "f9 7c 00"},
+      # { %(NaN), "f9 7e 00"},
+      # { %(-Infinity), "f9 fc 00"},
+      # { %(Infinity), "fa 7f 80 00 00"},
+      # { %(NaN), "fa 7f c0 00 00"},
+      # { %(-Infinity), "fa ff 80 00 00"},
+      # { %(Infinity), "fb 7f f0 00 00 00 00 00 00"},
+      # { %(NaN), "fb 7f f8 00 00 00 00 00 00"},
+      # { %(-Infinity), "fb ff f0 00 00 00 00 00 00"},
+      # { %(false), "f4"},
+      # { %(true), "f5"},
+      # { %(null), "f6"},
+      # { %(undefined), "f7"},
+      # { %(simple(16)), "f0"},
+      # { %(simple(24)), "f8 18"},
+      # { %(simple(255)), "f8 ff"},
+      # { %(0(\"2013-03-21T20:04:00Z\")), "c0 74 32 30 31 33 2d 30 33 2d 32 31 54 32 30 3a 30 34 3a 30 30 5a"},
+      # { %(1(1363896240)), "c1 1a 51 4b 67 b0"},
+      # { %(1(1363896240.5)), "c1 fb 41 d4 52 d9 ec 20 00 00"},
+      # { %(23(h'01020304')), "d7 44 01 02 03 04"},
+      # { %(24(h'6449455446')), "d8 18 45 64 49 45 54 46"},
+      # { %(32("http://www.example.com")), "d8 20 76 68 74 74 70 3a 2f 2f 77 77 77 2e 65 78 61 6d 70 6c 65 2e 63 6f 6d" },
+      # { %(h''), "40" },
+      # { %(h'01020304'), "44 01 02 03 04" },
+      # { %(""), "60" },
+      # { %("a"), "61 61" },
+      # { %("IETF"), "64 49 45 54 46" },
+      # { %(""\\"), "62225c" },
+      # { %("\u00fc"), "62 c3 bc" },
+      # { %("\u6c34"), "63 e6 b0 b4" },
+      # { %("\ud800\udd51"), "64 f0 90 85 91" },
+      # { %([]), "80" },
+      # { %([1, 2, 3]), "83 01 02 03" },
+      # { %([1, [2, 3], [4, 5]]), "83 01 82 02 03 82 04 05" },
+      # { %([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]), "98 19 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 18 18 19" },
+      # { %({}), "a0" },
+      # { %({1: 2, 3: 4}), "a2 01 02 03 04" },
+      # { %({"a": 1, "b": [2, 3]}), "a2 61 61 01 61 62 82 02 03" },
+      # { %(["a", {"b": "c"}]), "82 61 61 a1 61 62 61 63" },
+      # { %({"a": "A", "b": "B", "c": "C", "d": "D", "e": "E"}), "a5 61 61 61 41 61 62 61 42 61 63 61 43 61 64 61 44 61 65 61 45" },
+      # { %((_ h'0102', h'030405')), "5f 42 01 02 43 03 04 05 ff" },
+      # { %((_ "strea", "ming")), "7f 65 73 74 72 65 61 64 6d 69 6e 67 ff" },
+      # { %([_ ]), "9f ff" },
+      # { %([_ 1, [2, 3], [_ 4, 5]]), "9f 01 82 02 03 9f 04 05 ff ff" },
+      # { %([_ 1, [2, 3], [4, 5]]), "9f 01 82 02 03 82 04 05 ff" },
+      # { %([1, [2, 3], [_ 4, 5]]), "83 01 82 02 03 9f 04 05 ff" },
+      # { %([1, [_ 2, 3], [4, 5]]), "83 01 9f 02 03 ff 82 04 05" },
+      # { %([_ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]), "9f 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 18 18 19 ff" },
+      # { %({_ "a": 1, "b": [_ 2, 3]}), "bf 61 61 01 61 62 9f 02 03 ff ff" },
+      # { %(["a", {_ "b": "c"}]), "82 61 61 bf 61 62 61 63 ff" },
+      # { %({_ "Fun": true, "Amt": -2}), "bf 63 46 75 6e f5 63 41 6d 74 21 ff" },
     ]
 
     tests.each do |tt|