diff --git a/package-lock.json b/package-lock.json
index d9629c4..61cb4e2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,19 +1,19 @@
 {
   "name": "extrajs",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-7.0.2.tgz",
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+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-8.0.0.tgz",
+      "integrity": "sha512-jWeYcTo3sCH/rMgsdYXDTO85GNRyTCII5dayMIu/ZO4zbEot1E3iNGaOwpLReLUHjeNQFkgeNNVYlY4dX6azQQ==",
       "dev": true
     },
     "@types/node": {
-      "version": "13.11.1",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.11.1.tgz",
-      "integrity": "sha512-eWQGP3qtxwL8FGneRrC5DwrJLGN4/dH1clNTuLfN81HCrxVtxRjygDTUoZJ5ASlDEeo0ppYFQjQIlXhtXpOn6g=="
+      "version": "14.0.23",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.23.tgz",
+      "integrity": "sha512-Z4U8yDAl5TFkmYsZdFPdjeMa57NOvnaf1tljHzhouaPEp7LCj2JKkejpI1ODviIAQuW4CcQmxkQ77rnLsOOoKw=="
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     "ansi-colors": {
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@@ -576,13 +576,6 @@
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       "dev": true
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-    "commander": {
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-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
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-      "dev": true,
-      "optional": true
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       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
@@ -639,9 +632,9 @@
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-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.2.tgz",
-      "integrity": "sha512-PD6G8QG3S4FK/XCGFbEQrDqO2AnMMsy0meR7lerlIOHAAbkuavGU/pOqprrlvfTNjvowivTeBsjebAL0NSoMxw==",
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
+      "integrity": "sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==",
       "dev": true,
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@@ -835,22 +828,22 @@
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-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.5.tgz",
-      "integrity": "sha512-BR9auzDbySxOcfog0tLECW8l28eRGpDpU3Dm3Hp4q/N+VtLTmyj4EUN088XZWQDW/hzj6sYRDXeOFsaAODKvpg==",
+      "version": "1.17.6",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.6.tgz",
+      "integrity": "sha512-Fr89bON3WFyUi5EvAeI48QTWX0AyekGgLA8H+c+7fbfCkJwRWRMLd8CQedNEyJuoYYhmtEqY92pgte1FAhBlhw==",
       "dev": true,
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         "has": "^1.0.3",
         "has-symbols": "^1.0.1",
-        "is-callable": "^1.1.5",
-        "is-regex": "^1.0.5",
+        "is-callable": "^1.2.0",
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-        "string.prototype.trimleft": "^2.1.1",
-        "string.prototype.trimright": "^2.1.1"
+        "string.prototype.trimend": "^1.0.1",
+        "string.prototype.trimstart": "^1.0.1"
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     "es-to-primitive": {
@@ -1273,554 +1266,14 @@
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-      "integrity": "sha512-Ggd/Ktt7E7I8pxZRbGIs7vwqAPscSESMrCSkx2FtWeqmheJgCo2R74fTsZFCifr0VTPwqRpPv17+6b8Zp7th0Q==",
+      "version": "1.2.13",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
+      "integrity": "sha512-oWb1Z6mkHIskLzEJ/XWX0srkpkTQ7vaopMQkyaEIoq0fmtFVxOthb8cCxeT+p3ynTdkk/RZwbgG4brR5BeWECw==",
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-        "yallist": {
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+        "nan": "^2.12.1"
       }
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     "function-bind": {
@@ -1963,9 +1416,9 @@
       }
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+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.4.tgz",
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       "dev": true
     },
     "growl": {
@@ -1987,9 +1440,9 @@
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+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.10.0.tgz",
+      "integrity": "sha512-Esj5HG5WAyrLIdYU74Z3JdG2PxdIusvj6IWHMtlyESxc7kcDz7zYlYjpnSokn1UbpV0d/QX9fan7gkCNd/9BQA==",
       "dev": true,
-      "optional": true,
-      "requires": {
-        "commander": "~2.20.3"
-      }
+      "optional": true
     },
     "unc-path-regex": {
       "version": "0.1.2",
@@ -4393,9 +3823,9 @@
       "dev": true
     },
     "v8flags": {
-      "version": "3.1.3",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
-      "integrity": "sha512-amh9CCg3ZxkzQ48Mhcb8iX7xpAfYJgePHxWMQCBWECpOSqJUXgY26ncA61UTV0BkPqfhcy6mzwCIoP4ygxpW8w==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
+      "integrity": "sha512-mH8etigqMfiGWdeXpaaqGfs6BndypxusHHcv2qSHyZkGEznCd/qAXCWWRzeowtL54147cktFOC4P5y+kl8d8Jg==",
       "dev": true,
       "requires": {
         "homedir-polyfill": "^1.0.1"
@@ -4530,9 +3960,9 @@
       "dev": true
     },
     "yargs": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.0.tgz",
-      "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.1.tgz",
+      "integrity": "sha512-huO4Fr1f9PmiJJdll5kwoS2e4GqzGSsMT3PPMpOwoVkOK8ckqAewMTZyA6LXVQWflleb/Z8oPBEvNsMft0XE+g==",
       "dev": true,
       "requires": {
         "camelcase": "^3.0.0",
@@ -4547,16 +3977,17 @@
         "string-width": "^1.0.2",
         "which-module": "^1.0.0",
         "y18n": "^3.2.1",
-        "yargs-parser": "^5.0.0"
+        "yargs-parser": "5.0.0-security.0"
       }
     },
     "yargs-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
-      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
+      "version": "5.0.0-security.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0-security.0.tgz",
+      "integrity": "sha512-T69y4Ps64LNesYxeYGYPvfoMTt/7y1XtfpIslUeK4um+9Hu7hlGoRtaDLvdXb7+/tfq4opVa2HRY5xGip022rQ==",
       "dev": true,
       "requires": {
-        "camelcase": "^3.0.0"
+        "camelcase": "^3.0.0",
+        "object.assign": "^4.1.0"
       }
     },
     "yargs-unparser": {
diff --git a/package.json b/package.json
index 5112e74..284859a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "extrajs",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "description": "Javascript helpers for lazy people.",
   "main": "index.js",
   "scripts": {
@@ -26,16 +26,16 @@
   },
   "homepage": "https://github.com/chharvey/extrajs#readme",
   "devDependencies": {
-    "@types/mocha": "^7.0.2",
+    "@types/mocha": "^8.0.0",
     "gulp": "^4.0.0",
     "gulp-mocha": "^7.0.2",
     "gulp-typedoc": "^2.2.0",
     "gulp-typescript": "^5.0.0-alpha.3",
     "ts-node": "^8.8.2",
     "typedoc": "^0.17.4",
-    "typescript": "~3.8.3"
+    "typescript": "~3.9.6"
   },
   "dependencies": {
-    "@types/node": "^13.5.3"
+    "@types/node": "^14.0.23"
   }
 }
diff --git a/src/class/BigInt.class.ts b/src/class/BigInt.class.ts
index 3ec0205..aa8ab70 100644
--- a/src/class/BigInt.class.ts
+++ b/src/class/BigInt.class.ts
@@ -59,17 +59,17 @@ export default class xjs_BigInt {
 			]).get(type))
 		}
 		return new Map<NumericType, (n: bigint) => void>([
-			[NumericType.INTEGER     , (_n: bigint) => {}                                                 ],
-			[NumericType.NATURAL     , ( n: bigint) => xjs_BigInt.assertType(n, NumericType.NONNEGATIVE)  ],
-			[NumericType.WHOLE       , ( n: bigint) => xjs_BigInt.assertType(n, NumericType.POSITIVE   )  ],
-			[NumericType.FLOAT       , (_n: bigint) => assert(false   , 'BigInts cannot be non-integers.')],
-			[NumericType.POSITIVE    , ( n: bigint) => assert(0n <  n , `${n} must be positive.`         )],
-			[NumericType.NEGATIVE    , ( n: bigint) => assert(n  <  0n, `${n} must be negative.`         )],
-			[NumericType.NONPOSITIVE , ( n: bigint) => assert(n  <= 0n, `${n} must not be positive.`     )],
-			[NumericType.NONNEGATIVE , ( n: bigint) => assert(0n <= n , `${n} must not be negative.`     )],
-			[NumericType.NONZERO     , ( n: bigint) => assert(n !== 0n, `${n} must not be zero.`         )],
-			[NumericType.FINITE      , (_n: bigint) => {}                                                 ],
-			[NumericType.INFINITE    , (_n: bigint) => assert(false   , 'BigInts cannot be infinite.'    )],
+			[NumericType.INTEGER     , (_n: bigint) => {}                                                    ],
+			[NumericType.NATURAL     , ( n: bigint) => xjs_BigInt.assertType(n, NumericType.NONNEGATIVE)     ],
+			[NumericType.WHOLE       , ( n: bigint) => xjs_BigInt.assertType(n, NumericType.POSITIVE   )     ],
+			[NumericType.FLOAT       , (_n: bigint) => assert.ok(false   , 'BigInts cannot be non-integers.')],
+			[NumericType.POSITIVE    , ( n: bigint) => assert.ok(0n <  n , `${n} must be positive.`         )],
+			[NumericType.NEGATIVE    , ( n: bigint) => assert.ok(n  <  0n, `${n} must be negative.`         )],
+			[NumericType.NONPOSITIVE , ( n: bigint) => assert.ok(n  <= 0n, `${n} must not be positive.`     )],
+			[NumericType.NONNEGATIVE , ( n: bigint) => assert.ok(0n <= n , `${n} must not be negative.`     )],
+			[NumericType.NONZERO     , ( n: bigint) => assert.ok(n !== 0n, `${n} must not be zero.`         )],
+			[NumericType.FINITE      , (_n: bigint) => {}                                                    ],
+			[NumericType.INFINITE    , (_n: bigint) => assert.ok(false   , 'BigInts cannot be infinite.'    )],
 		]).get(type) !(int)
 	}
 
diff --git a/src/class/Number.class.ts b/src/class/Number.class.ts
index b62f8b5..6fedace 100644
--- a/src/class/Number.class.ts
+++ b/src/class/Number.class.ts
@@ -81,17 +81,17 @@ export default class xjs_Number {
 			]).get(type))
 		}
 		return new Map<NumericType, (n: number) => void>([
-			[NumericType.INTEGER     , (n: number) => assert( Number.isInteger(n)          , `${n} must be an integer.`            )],
-			[NumericType.NATURAL     , (n: number) => assert( Number.isInteger(n) && 0 <= n, `${n} must be a non-negative integer.`)],
-			[NumericType.WHOLE       , (n: number) => assert( Number.isInteger(n) && 0 <  n, `${n} must be a positive integer.`    )],
-			[NumericType.FLOAT       , (n: number) => assert(!Number.isInteger(n)          , `${n} must not be an integer.`        )],
-			[NumericType.POSITIVE    , (n: number) => assert(0 < n                         , `${n} must be a positive number.`     )],
-			[NumericType.NEGATIVE    , (n: number) => assert(n < 0                         , `${n} must be a negative number.`     )],
-			[NumericType.NONPOSITIVE , (n: number) => assert(n <= 0                        , `${n} must not be a positive number.` )],
-			[NumericType.NONNEGATIVE , (n: number) => assert(0 <= n                        , `${n} must not be a negative number.` )],
-			[NumericType.NONZERO     , (n: number) => assert(n !== 0                       , `${n} must not be zero.`              )],
-			[NumericType.FINITE      , (n: number) => assert( Number.isFinite(n)           , `${n} must be a finite number.`       )],
-			[NumericType.INFINITE    , (n: number) => assert(!Number.isFinite(n)           , `${n} must be an infinite number.`    )],
+			[NumericType.INTEGER     , (n: number) => assert.ok( Number.isInteger(n)          , `${n} must be an integer.`            )],
+			[NumericType.NATURAL     , (n: number) => assert.ok( Number.isInteger(n) && 0 <= n, `${n} must be a non-negative integer.`)],
+			[NumericType.WHOLE       , (n: number) => assert.ok( Number.isInteger(n) && 0 <  n, `${n} must be a positive integer.`    )],
+			[NumericType.FLOAT       , (n: number) => assert.ok(!Number.isInteger(n)          , `${n} must not be an integer.`        )],
+			[NumericType.POSITIVE    , (n: number) => assert.ok(0 < n                         , `${n} must be a positive number.`     )],
+			[NumericType.NEGATIVE    , (n: number) => assert.ok(n < 0                         , `${n} must be a negative number.`     )],
+			[NumericType.NONPOSITIVE , (n: number) => assert.ok(n <= 0                        , `${n} must not be a positive number.` )],
+			[NumericType.NONNEGATIVE , (n: number) => assert.ok(0 <= n                        , `${n} must not be a negative number.` )],
+			[NumericType.NONZERO     , (n: number) => assert.ok(n !== 0                       , `${n} must not be zero.`              )],
+			[NumericType.FINITE      , (n: number) => assert.ok( Number.isFinite(n)           , `${n} must be a finite number.`       )],
+			[NumericType.INFINITE    , (n: number) => assert.ok(!Number.isFinite(n)           , `${n} must be an infinite number.`    )],
 		]).get(type) !(num)
 	}