add perf tests, fixes #1053 (#1054)

package-lock.json

@@ -1375,6 +1375,16 @@
         "tweetnacl": "0.14.5"
       }
     },
+    "benchmark": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/benchmark/-/benchmark-2.1.4.tgz",
+      "integrity": "sha1-CfPeMckWQl1JjMLuVloOvzwqVik=",
+      "dev": true,
+      "requires": {
+        "lodash": "4.17.4",
+        "platform": "1.3.4"
+      }
+    },
     "big.js": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-3.2.0.tgz",
@@ -6292,7 +6302,7 @@
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         "istanbul-lib-source-maps": "1.2.2",
         "istanbul-reports": "1.1.3",
-        "js-yaml": "3.8.4",
+        "js-yaml": "3.10.0",
         "mkdirp": "0.5.1",
         "once": "1.4.0"
       },
@@ -7326,13 +7336,21 @@
       "dev": true
     },
     "js-yaml": {
-      "version": "3.8.4",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.8.4.tgz",
-      "integrity": "sha1-UgtFZPhlc7qWZir4Woyvp7S1pvY=",
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.10.0.tgz",
+      "integrity": "sha512-O2v52ffjLa9VeM43J4XocZE//WT9N0IiwDa3KSHH7Tu8CtH+1qM8SIZvnsTh6v+4yFy5KUY3BHUVwjpfAWsjIA==",
       "dev": true,
       "requires": {
         "argparse": "1.0.9",
-        "esprima": "3.1.3"
+        "esprima": "4.0.0"
+      },
+      "dependencies": {
+        "esprima": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.0.tgz",
+          "integrity": "sha512-oftTcaMu/EGrEIu904mWteKIv8vMuOgGYo7EhVJJN00R/EED9DCua/xxHRdYnKtcECzVg7xOWhflvJMnqcFZjw==",
+          "dev": true
+        }
       }
     },
     "jsbn": {
@@ -8969,6 +8987,12 @@
         "find-up": "2.1.0"
       }
     },
+    "platform": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/platform/-/platform-1.3.4.tgz",
+      "integrity": "sha1-bw+xftqqSPIUQrOpdcBjEw8cPr0=",
+      "dev": true
+    },
     "pluralize": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-7.0.0.tgz",