v1.19.0

Bug fixes

• Variable resolver now correctly resolves variables that are captured in a closure.
• NativeCallContext<'_> (with a lifetime parameter) now parses correctly in the #[export_module] macro. This is to allow for rust_2018_idioms lints (thanks @ltabis 864).
• The sync feature now works properly in no-std builds (thanks @misssonder 874).
• More data-race conditions are caught and returned as errors instead of panicking.
• Missing min and max functions where both operands are floats or Decimal are added.
• Fixed stack overflow when calling closures recursively (thanks @MageWeiG 880).
• Engine::call_fn and Engine::call_fn_with_options now correctly use the AST's source field.
• (Fuzzing) Fixed crash when using ..= in strings.
• (Fuzzing) A recursive stack-overflow bug in Dynamic::is_hashable is fixed.

New features

• The break, continue, return and throw statements can now follow the ?? operator to short-circuit operations where the value is ().
• A new symbol, $func$, is added to custom syntax to allow parsing of anonymous functions.
• The filter, drain and retain methods are added to object maps.