diff --git a/src/complex/add.mjs b/src/complex/add.mjs
index 3583b38..d44d3fd 100644
--- a/src/complex/add.mjs
+++ b/src/complex/add.mjs
@@ -1,10 +1,13 @@
 export {Types} from './Types/Complex.mjs'
 
 export const add = {
-   '...Complex': [['self'], ref => addends => {
-      if (addends.length === 0) return {re:0, im:0}
-      const seed = addends.shift()
-      return addends.reduce((w,z) =>
-         ({re: ref.self(w.re, z.re), im: ref.self(w.im, z.im)}), seed)
-   }]
+   '...Complex': {
+      uses: ['self'],
+      does: ref => addends => {
+         if (addends.length === 0) return {re:0, im:0}
+         const seed = addends.shift()
+         return addends.reduce((w,z) =>
+            ({re: ref.self(w.re, z.re), im: ref.self(w.im, z.im)}), seed)
+      }
+   }
 }
diff --git a/src/complex/complex.mjs b/src/complex/complex.mjs
index c86c3e8..9a5cee9 100644
--- a/src/complex/complex.mjs
+++ b/src/complex/complex.mjs
@@ -5,7 +5,7 @@ export const complex = {
     * have a numeric/scalar type, e.g. by implementing subtypes in
     * typed-function
     */
-   'any, any': [[], (x, y) => ({re: x, im: y})],
+   'any, any': {does: (x, y) => ({re: x, im: y})},
    /* Take advantage of conversions in typed-function */
-   Complex: [[], z => z]
+   Complex: {does: z => z}
 }
diff --git a/src/complex/negate.mjs b/src/complex/negate.mjs
index bf4e612..9cb21c6 100644
--- a/src/complex/negate.mjs
+++ b/src/complex/negate.mjs
@@ -1,7 +1,10 @@
 export {Types} from './Types/Complex.mjs'
 
 export const negate = {
-   Complex: [['self'], ref => z => {
-      return {re: ref.self(z.re), im: ref.self(z.im)}
-   }]
+   Complex: {
+      uses: ['self'],
+      does: ref => z => {
+         return {re: ref.self(z.re), im: ref.self(z.im)}
+      }
+   }
 }
diff --git a/src/core/PocomathInstance.mjs b/src/core/PocomathInstance.mjs
index 3093291..fcb86f9 100644
--- a/src/core/PocomathInstance.mjs
+++ b/src/core/PocomathInstance.mjs
@@ -70,7 +70,12 @@ export default class PocomathInstance {
          for (const func in this._imps) {
             if (func === 'Types') continue
             for (const definition of Object.values(this._imps[func])) {
-               for (const dependency of definition[0]) {
+               let deps = []
+               if (Array.isArray(definition)) deps = definition[0]
+               else if (typeof definition === 'object') {
+                  deps = definition.uses || deps
+               }
+               for (const dependency of deps) {
                   const depName = dependency.split('(',1)[0]
                   if (doneSet.has(depName)) continue
                   requiredSet.add(depName)
@@ -158,7 +163,20 @@ export default class PocomathInstance {
       this._ensureTypes()
       const tf_imps = {}
       for (const signature in imps) {
-         const [deps, imp] = imps[signature]
+         const specifier = imps[signature]
+         let deps = []
+         let imp
+         if (typeof specifier === 'function') {
+            imp = specifier
+         } else if (Array.isArray(specifier)) {
+            [deps, imp] = specifier
+         } else if (typeof specifier === 'object') {
+            deps = specifier.uses || deps
+            imp = specifier.does
+         } else {
+            throw new SyntaxError(
+               `Cannot interpret signature definition ${specifier}`)
+         }
          if (deps.length === 0) {
             tf_imps[signature] = imp
          } else {
diff --git a/src/number/add.mjs b/src/number/add.mjs
index 70be9bb..d47b10e 100644
--- a/src/number/add.mjs
+++ b/src/number/add.mjs
@@ -1,5 +1,5 @@
 export {Types} from './Types/number.mjs'
 
 export const add = {
-   '...number': [[], addends => addends.reduce((x,y) => x+y, 0)],
+   '...number': addends => addends.reduce((x,y) => x+y, 0),
 }
diff --git a/src/number/negate.mjs b/src/number/negate.mjs
index aaf8bc0..bdfa823 100644
--- a/src/number/negate.mjs
+++ b/src/number/negate.mjs
@@ -1,3 +1,3 @@
 export { Types } from './Types/number.mjs'
 
-export const negate = {number: [[], n => -n]}
+export const negate = {number: n => -n}