diff --git a/src/mami.js/args.js b/src/mami.js/args.js
index a7f518c..2cc6e95 100644
--- a/src/mami.js/args.js
+++ b/src/mami.js/args.js
@@ -1,64 +1,180 @@
-const MamiArguments = (function() {
-    return {
-        type: (name, type, fallback, throwOnFail) => {
-            if(typeof name !== 'string')
-                throw 'name must be a string';
-            if(typeof type !== 'string')
-                throw 'type must be a string';
+const MamiArgs = (argName, input, builder) => {
+    if(input !== undefined && typeof input !== 'object')
+        throw `${argName} must be an object or undefined`;
+    if(typeof builder !== 'function')
+        throw 'builder must be a function';
 
-            return { name: name, type: type, fallback: fallback, throwOnFail: !!throwOnFail };
-        },
+    const args = new Map;
 
-        check: (name, fallback, check, throwOnFail) => {
-            if(typeof name !== 'string')
-                throw 'name must be a string';
-            if(typeof check !== 'function')
-                throw 'check must be a function';
+    builder(name => {
+        if(typeof name !== 'string')
+            throw 'name must be a string';
 
-            return { name: name, fallback: fallback, check: check, throwOnFail: !!throwOnFail };
-        },
+        const checkDefined = () => {
+            if(args.has(name))
+                throw `${name} has already been defined`;
+        };
+        checkDefined();
 
-        filter: (name, type, fallback, filter, throwOnFail) => {
-            if(typeof name !== 'string')
-                throw 'name must be a string';
-            if(typeof type !== 'string')
-                throw 'type must be a string';
-            if(typeof filter !== 'function')
-                throw 'filter must be a function';
+        let created = false;
+        const checkCreated = () => {
+            if(created)
+                throw 'argument has already been defined';
+        };
 
-            return { name: name, type: type, fallback: fallback, filter: filter, throwOnFail: !!throwOnFail };
-        },
+        const info = {
+            name: name,
+            type: undefined,
+            filter: undefined,
+            constraint: undefined,
+            fallback: undefined,
+            throw: true,
+            required: false,
+            min: undefined,
+            max: undefined,
+        };
 
-        verify: (args, options) => {
-            if(!Array.isArray(options))
-                throw 'options must be an array';
-            if(typeof args !== 'object')
-                args = {};
+        const blueprint = {
+            type: value => {
+                if(typeof value !== 'string' && !Array.isArray(value))
+                    throw 'type must be a javascript type or array of valid string values';
 
-            for(const option of options) {
-                if(typeof option !== 'object')
-                    throw 'entries of options must be objects';
-                if(!('name' in option) || typeof option.name !== 'string')
-                    throw 'option.name must be a string';
-                const name = option.name;
-                const type = 'type' in option && typeof option.type === 'string' ? option.type : undefined;
-                const fallback = 'fallback' in option ? option.fallback : undefined;
-                const check = 'check' in option && typeof option.check === 'function' ? option.check : undefined;
-                const filter = 'filter' in option && typeof option.filter === 'function' ? option.filter : undefined;
-                const throwOnFail = 'throwOnFail' in option && option.throwOnFail;
+                checkCreated();
 
-                if(!(name in args)
-                    || (type !== undefined && typeof args[name] !== type)
-                    || (check !== undefined && !check(args[name]))) {
-                    if(throwOnFail)
-                        throw `${name} is invalid`;
+                info.type = value;
+                return blueprint;
+            },
+            default: value => {
+                checkCreated();
+                info.fallback = value;
 
-                    args[name] = fallback;
-                } else if(filter !== undefined)
-                    args[name] = filter(args[name]);
+                if(info.type === undefined && info.constraint === undefined)
+                    info.type = typeof info.fallback;
+
+                return blueprint;
+            },
+            filter: value => {
+                if(typeof value !== 'function')
+                    throw 'filter must be a function';
+
+                checkCreated();
+
+                info.filter = value;
+                return blueprint;
+            },
+            constraint: value => {
+                if(typeof value !== 'function')
+                    throw 'constraint must be a function';
+
+                checkCreated();
+
+                info.constraint = value;
+                return blueprint;
+            },
+            throw: value => {
+                checkCreated();
+                info.throw = value === undefined || value === true;
+                return blueprint;
+            },
+            required: value => {
+                checkCreated();
+                info.required = value === undefined || value === true;
+                return blueprint;
+            },
+            min: value => {
+                checkCreated();
+                if(typeof value !== 'number')
+                    throw 'value must be a number';
+
+                info.min = value;
+                return blueprint;
+            },
+            max: value => {
+                checkCreated();
+                if(typeof value !== 'number')
+                    throw 'value must be a number';
+
+                info.max = value;
+                return blueprint;
+            },
+            done: () => {
+                checkCreated();
+                checkDefined();
+
+                args.set(name, info);
+            },
+        };
+
+        return blueprint;
+    });
+
+    const inputIsNull = input === null;
+    if(inputIsNull)
+        input = {};
+
+    const output = {};
+
+    for(const [name, info] of args) {
+        let value = info.fallback;
+
+        if(info.name in input) {
+            const defaultOrThrow = ex => {
+                if(info.throw)
+                    throw ex;
+                value = info.fallback;
+            };
+
+            value = input[info.name];
+
+            if(info.type !== undefined) {
+                if(Array.isArray(info.type)) {
+                    if(!info.type.includes(value))
+                        defaultOrThrow(`${info.name} must match an enum value`);
+                } else {
+                    const type = typeof value;
+                    let resolved = false;
+
+                    if(type !== info.type) {
+                        if(type === 'string') {
+                            if(info.type === 'number') {
+                                value = parseFloat(value);
+                                resolved = true;
+
+                                if(info.min !== undefined && value < info.min)
+                                    value = info.min;
+                                else if(info.max !== undefined && value > info.max)
+                                    value = info.max;
+                            } else if(info.type === 'boolean') {
+                                value = !!value;
+                                resolved = true;
+                            }
+                        } else if(info.type === 'string') {
+                            value = value.toString();
+                            resolved = true;
+                        }
+                    } else resolved = true;
+
+                    if(!resolved)
+                        defaultOrThrow(`${info.name} must be of type ${info.type}`);
+                }
             }
 
-            return args;
-        },
-    };
-})();
+            if(info.constraint !== undefined && !info.constraint(value))
+                defaultOrThrow(`${info.name} did not fit within constraints`);
+
+            // you could have a devious streak with this one cuz the checks aren't rerun
+            // but surely you wouldn't fuck yourself over like that
+            if(info.filter !== undefined)
+                value = info.filter(value);
+        } else if(info.required) {
+            if(inputIsNull)
+                throw `${argName} must be a non-null object`;
+
+            throw `${argName} is missing required key ${info.name}`;
+        }
+
+        output[info.name] = value;
+    }
+
+    return output;
+};
diff --git a/src/mami.js/colpick/picker.jsx b/src/mami.js/colpick/picker.jsx
index 70497c4..7d4176f 100644
--- a/src/mami.js/colpick/picker.jsx
+++ b/src/mami.js/colpick/picker.jsx
@@ -9,18 +9,18 @@
 #include colpick/vraw.jsx
 
 const MamiColourPicker = function(options) {
-    options = MamiArguments.verify(options, [
-        MamiArguments.filter('colour', 'number', 0, num => Math.min(0xFFFFFF, Math.max(0, num))),
-        MamiArguments.type('posX', 'number', -1),
-        MamiArguments.type('posY', 'number', -1),
-        MamiArguments.type('presets', 'object', []),
-        MamiArguments.type('showPresetsTab', 'boolean', options.presets.length > 0),
-        MamiArguments.type('showGridTab', 'boolean', true),
-        MamiArguments.type('showSlidersTab', 'boolean', true),
-        MamiArguments.type('showHexValue', 'boolean', true),
-        MamiArguments.type('showRawValue', 'boolean', true),
-        MamiArguments.type('showDialogButtons', 'boolean', true),
-    ]);
+    options = MamiArgs('options', options, define => {
+        define('colour').default(0).filter(value => Math.min(0xFFFFFF, Math.max(0, value))).done();
+        define('posX').default(-1).done();
+        define('posY').default(-1).done();
+        define('presets').default([]).constraint(value => Array.isArray(value)).done();
+        define('showPresetsTab').default(true).done();
+        define('showGridTab').default(true).done();
+        define('showSlidersTab').default(true).done();
+        define('showHexValue').default(true).done();
+        define('showRawValue').default(true).done();
+        define('showDialogButtons').default(true).done();
+    });
 
     let colour;
     const needsColour = [];
@@ -115,7 +115,7 @@ const MamiColourPicker = function(options) {
         },
     });
 
-    if(options.showPresetsTab)
+    if(options.showPresetsTab && options.presets.length > 0)
         tabs.add(new MamiColourPickerPresetsTab(options.presets));
     if(options.showGridTab)
         tabs.add(new MamiColourPickerGridTab);
diff --git a/src/mami.js/controls/msgbox.jsx b/src/mami.js/controls/msgbox.jsx
index ff06545..7865492 100644
--- a/src/mami.js/controls/msgbox.jsx
+++ b/src/mami.js/controls/msgbox.jsx
@@ -238,9 +238,9 @@ const MamiMessageBoxDialog = function(info) {
 };
 
 const MamiMessageBoxControl = function(options) {
-    options = MamiArguments.verify(options, [
-        MamiArguments.check('parent', undefined, value => value instanceof Element, true),
-    ]);
+    options = MamiArgs('options', options, define => {
+        define('parent').required().constraint(value => value instanceof Element).done();
+    });
 
     const parent = options.parent;
     const container = new MamiMessageBoxContainer;
diff --git a/src/mami.js/controls/tabs.js b/src/mami.js/controls/tabs.js
index 0546a15..05a9ed1 100644
--- a/src/mami.js/controls/tabs.js
+++ b/src/mami.js/controls/tabs.js
@@ -2,11 +2,11 @@
 #include uniqstr.js
 
 const MamiTabsControl = function(options) {
-    options = MamiArguments.verify(options, [
-        MamiArguments.type('onAdd', 'function', undefined, true),
-        MamiArguments.type('onRemove', 'function', undefined, true),
-        MamiArguments.type('onSwitch', 'function', undefined, true),
-    ]);
+    options = MamiArgs('options', options, define => {
+        define('onAdd').required().type('function').done();
+        define('onRemove').required().type('function').done();
+        define('onSwitch').required().type('function').done();
+    });
 
     const onAdd = options.onAdd,
         onRemove = options.onRemove,
diff --git a/src/mami.js/controls/views.js b/src/mami.js/controls/views.js
index 7061592..c22b664 100644
--- a/src/mami.js/controls/views.js
+++ b/src/mami.js/controls/views.js
@@ -2,9 +2,9 @@
 #include utility.js
 
 const MamiViewsControl = function(options) {
-    options = MamiArguments.verify(options, [
-        MamiArguments.check('body', undefined, value => value instanceof Element, true),
-    ]);
+    options = MamiArgs('options', options, define => {
+        define('body').required().constraint(value => value instanceof Element).done();
+    });
 
     const targetBody = options.body;
     targetBody.classList.toggle('views', true);
diff --git a/src/mami.js/settings/settings.js b/src/mami.js/settings/settings.js
index 3092f81..bab9385 100644
--- a/src/mami.js/settings/settings.js
+++ b/src/mami.js/settings/settings.js
@@ -146,7 +146,7 @@ const MamiSettings = function(storageOrPrefix, eventTarget) {
         const pub = {
             type: value => {
                 if(typeof value !== 'string' && !Array.isArray(value))
-                    throw 'type must be a javascript type or array of valid string values.';
+                    throw 'type must be a javascript type or array of valid string values';
 
                 checkCreated();
 
diff --git a/src/mami.js/title.js b/src/mami.js/title.js
index c1b7378..bf7a8f1 100644
--- a/src/mami.js/title.js
+++ b/src/mami.js/title.js
@@ -1,18 +1,12 @@
 #include args.js
 
 const MamiWindowTitle = function(options) {
-    options = MamiArguments.verify(options, [
-        MamiArguments.type('getName', 'function', () => ''),
-        MamiArguments.type('setTitle', 'function', text => document.title = text),
-        MamiArguments.check('strobeInterval', 500, val => {
-            const valType = typeof val;
-            return val === 'number' || val === 'function';
-        }),
-        MamiArguments.check('strobeRepeat', 5, val => {
-            const valType = typeof val;
-            return val === 'number' || val === 'function';
-        }),
-    ]);
+    options = MamiArgs('options', options, define => {
+        define('getName').default(() => {}).done();
+        define('setTitle').default(text => { document.title = text; }).done();
+        define('strobeInterval').constraint(value => typeof value === 'number' || typeof value === 'function').default(500).done();
+        define('strobeRepeat').constraint(value => typeof value === 'number' || typeof value === 'function').default(5).done();
+    });
 
     const getName = options.getName;