rename start to sourceLength

Author: chm-diederichs

lib/core.js

@@ -226,7 +226,7 @@ module.exports = class Core {
     return false
   }
 
-  async copyFrom (src, signature, { length = src.tree.length, start = src.tree.length, fork = src.tree.fork, additional = [] } = {}) {
+  async copyFrom (src, signature, { length = src.tree.length, sourceLength = src.tree.length, fork = src.tree.fork, additional = [] } = {}) {
     await this._mutex.lock()
 
     try {
@@ -288,7 +288,7 @@ module.exports = class Core {
       // add additional blocks
       if (length > src.tree.length) {
         const missing = length - src.tree.length
-        const offset = src.tree.length - start
+        const offset = src.tree.length - sourceLength
 
         if (additional.length < missing + offset) {
           throw INVALID_OPERATION('Insufficient additional nodes were passed')