Colin Kelley

Issue #168/string keys for consumer message headers

4

Addresses issue #168: - Change `Headers` to return `Hash` as documented, starting with corresponding spec change. - Rdoc updates. These simplifications are also included: - Change `Headers` to a `Module`...

Headers.from_native rdoc says it returns Hash<String, String> but actually it is Hash<Symbol, String>

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I was surprised to get `headers` returned as a `Hash` when the [Headers documentation](https://github.com/appsignal/rdkafka-ruby/blob/main/lib/rdkafka/consumer/headers.rb#L7) and [Message documentation](https://github.com/appsignal/rdkafka-ruby/blob/main/lib/rdkafka/consumer/message.rb#L29) both say `Hash`. I'd happy to make a PR to address this. My...

### Host operating system: output of `uname -a` `Linux 4.19.0-18-cloud-amd64 #1 SMP Debian 4.19.208-1 (2021-09-29) x86_64 GNU/Linux` ### mysqld_exporter version: output of `mysqld_exporter --version` 0.12.1 ### MySQL server version 5.7...

This is a PR for issue #746. It is a direct port from https://github.com/percona/mysqld_exporter/pull/56.

Suggested API change

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## Problem Statement Recently I've worked with a team of ~6 developers converting two services from `EventMachine` + `Synchrony` to `Async`. That has gone well, but one detail of the...

I noticed that the `LRUCache` had unnecessary complexity with `NOT_EXIST = Object.new.freeze`. Changes in this PR: 1. Simplifies the implementation to remove the `NOT_EXIST` constant from the implementation. 2. Simplifies...