github.com/onflow/cadence

Releases

1. v0.20.122 Nov 2021

   Nothing published for this version

2. v0.20.017 Nov 2021
   Release notes2 sources agree

   This release culminates a half-year effort to improve the Cadence storage layer, i.e. how Cadence values are stored in accounts, in particular arrays, dictionaries, and composite values. @fxamacker and @ramtinms designed and implemented completely new array and ordered map data structures, resulting in atree. These data structures are fast and scalable: they allow efficient access and allow efficient modifications to arrays and dictionaries with very large number of elements. @turbolent and @SupunS integrated this new library into Cadence. This new storage layer also fixed a bug in the resource owner field. Please see the breaking changes section for more details.

   In addition, this release saw several feature and documentation contributions by new community members. Thank you!

   💥 Breaking Changes

   • With the storage layer update, the owner field of resources is now implemented correctly, as originally designed: The field is only non-nil if the resource is currently in storage, and is always nil if the resource is on the stack. This breaking change is actually a bug fix, as the owner field was previously implemented incorrectly: After a resource was moved out of storage onto the stack, the owner field was still referring to the account the resource was stored in.

     Please ensure your Cadence programs do not rely on the broken behaviour and update them if needed.

     For example, in a function that is passed a resource as an argument, the resource's owner field will always be nil:

     pub fun deposit(token: @NonFungibleToken.NFT) {
         // token.owner is always nil!
         // ...
     }
     

   • Add limit on call stack depth (#1138) @SupunS

   ⭐ Features

   • Add Path.toString() with tests and documentation. (#1141) @rheaplex
   • Adding toLower() to String type (#1176) @bjartek
   • Add isSubtype function for runtime values (#1189) @dsainati1

   🛠 Improvements

   • Introduce TokenStream interface (#1113) @jsatdapr
   • Remove obsolete script/transaction parameter check (#1114) @SupunS
   • Add static type to host functions (#1144) @SupunS
   • Infer RHS of nil-coalescing operator to have non-optional type of LHS (#1154) @turbolent
   • Use new atree library for arrays, dictionaries, and composite values (#1156) @turbolent
   • Limit error line lengths (#1165) @turbolent
   • Add dynamic sub-typing for function types (#1172) @SupunS
   • Remove CompositeDeclarations check from FunctionEntryPointDeclaration (#1175) @janezpodhostnik
   • Check slab and account storage health (#1193) @turbolent

   🐞 Bug Fixes

   • Fix export errors by properly wrapping in runtime errors (#1139) @SupunS
   • Fix array function member type creation (#1146) @SupunS
   • Add missing function type for Path.toString (#1150) @turbolent
   • Consider constant-sized type's size when checking dynamic array type (#1158) @turbolent
   • Fix move operator on empty resource collections (#1159) @SupunS
   • Fix block ID static type (#1168) @turbolent
   • Reintroduce and fix stringAtreeValue (#1174) @turbolent
   • Fix reference uses after moves (#1180) @turbolent

   📖 Documentation

   • Core events documentation (#1110) @sideninja
   • Migrate remaining docs from docs site. (#1155) @10thfloor
   • Fix bad link in Cadence tutorial page 01 (#1167) @kerrywei
   • Fixing typo (#1182) @sovietspy2
   • Fix units on storageUsed and storageCapacity data members (bytes) (#1184) @Giners
   • Fix typos (#1187, #1188, #1191, #1194) @markstrefford

   🙌 New Contributors

   Thank you to all new contributors:

   • @rheaplex
   • @dsainati1
   • @jsatdapr
   • @kerrywei
   • @sovietspy2
   • @markstrefford
   • @Giners

   Changelog

   https://github.com/onflow/cadence/compare/v0.19.1...v0.20.0

   [Changes][v0.20.0]

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