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tracing-subscriber-0.2.1

tracing-subscriber-0.2.1: subscriber: prepare to release 0.2.1 (#586)
@hawkw hawkw tagged this 14 Feb 18:56 
### Changed

- **filter**: `EnvFilter` directive selection now behaves correctly
  (i.e. like `env_logger`) (#583)

### Fixed

- **filter**: Fixed `EnvFilter` incorrectly allowing less-specific
  filter directives to enable events that are disabled by more-specific
  filters (#583)
- **filter**: Multiple significant `EnvFilter`  performance
  improvements, especially when filtering events generated by `log`
  records (#578, #583)
- **filter**: Replaced `BTreeMap` with `Vec` in `DirectiveSet`,
  improving iteration performance significantly with typical numbers of
  filter directives (#580)

A big thank-you to @samschlegel for lots of help with `EnvFilter` 
performance tuning in this release!

Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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