Ruby on rails Rails 5服务器切换到默认端口而不是指定端口

我正在安装一台新的Mac（macOS 10.12.3）。我已经安装了RVM、Homebrew等。到目前为止，唯一安装的Ruby是2.4.0，Rails是5.0.1。rails命令是：

$ rails new food_lookup --api

在运行Rails服务器进行开发工作时，我指定了端口3001，但出于某种原因，服务器决定侦听端口3000<代码>监听tcp://0.0.0.0:3000

$ rails server --port=3001
/Users/me/.rvm/gems/ruby-2.4.0@food_lookup/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
/Users/me/.rvm/gems/ruby-2.4.0@food_lookup/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
=> Booting Puma
=> Rails 5.0.1 application starting in development on http://localhost:3001
=> Run `rails server -h` for more startup options
/Users/me/.rvm/gems/ruby-2.4.0@food_lookup/gems/activesupport-5.0.1/lib/active_support/core_ext/numeric/conversions.rb:138: warning: constant ::Fixnum is deprecated
Puma starting in single mode...
* Version 3.7.0 (ruby 2.4.0-p0), codename: Snowy Sagebrush
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop

此时我的日志是空的

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有人见过这个吗？它在我以前的Mac上使用OSX10.11运行得非常好。我有相同版本的Rails、Ruby等，但可能我忘了在这台新机器上安装一些东西？

显然这是本周发布的Puma 3.7.0的问题