Document Fiddle

Author: chrisseaton

CHANGELOG.md

@@ -1,5 +1,9 @@
 # 19.2.0
 
+New features:
+
+* `Fiddle` has been implemented.
+
 Bug fixes:
 
 * Set `RbConfig::CONFIG['ruby_version']` to the same value as the TruffleRuby version. This fixes reusing C extensions between different versions of TruffleRuby with Bundler (#1715).

doc/contributor/stdlib.md

@@ -26,7 +26,7 @@
 | `fcntl`               |                                                                       | C extension                         | Java extension                                            | Ruby                                             | None                                  |                                                                                          |
 | `ffi`                 |                                                                       |                                     | Java extension                                            | Ruby using `Polyglot` but it's limited           | In the third-party FFi gem repository | Non-standard - third-party gem but defaults to included version on other implementations |
 | `fiber`               |                                                                       | C extension                         | Java extension                                            | Java primitives                                  | Specs                                 |                                                                                          |
-| `fiddle`              | FFI                                                                   | C extension                         | Ruby using `FFI`                                          | Ruby using `Polyglot` and `FFI` but it's limited | MRI                                   |                                                                                          |
+| `fiddle`              | FFI                                                                   | C extension                         | Ruby using `FFI`                                          | Ruby using `Polyglot`.                           | MRI                                   |                                                                                          |
 | `fileutils`           |                                                                       | Ruby                                | As MRI (not in source repo)                               | As MRI                                           | MRI                                   |                                                                                          |
 | `find`                | Traverse file systems                                                 | Ruby                                | As MRI                                                    | As MRI                                           | Specs, MRI                            |                                                                                          |
 | `forwardable`         | Method-call forwarding                                                | Ruby                                | As MRI                                                    | As MRI                                           | MRI                                   |                                                                                          |

doc/user/compatibility.md

@@ -72,9 +72,6 @@ The following standard libraries are unsupported.
 * `win32`
 * `win32ole`
 
-`fiddle` is not yet implemented - the module and some methods are there
-but not enough to run anything serious.
-
 We provide our own included implementation of the interface of the `ffi` gem,
 like JRuby and Rubinius. The implementation should be fairly complete and passes
 all the specs of the `ffi` gem except for some rarely-used corner cases.