我已升级到4.1.8，现在当我打开控制台会话并执行require "active_record"时，我得到以下输出：
[1] pry(main)> require 'active_record'
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::BASE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_ALL
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_NaN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_INFINITY
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_UNDERFLOW
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_OVERFLOW
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_ZERODIVIDE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_MODE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_UP
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_DOWN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_UP
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_DOWN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_CEILING
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_FLOOR
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_EVEN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NaN
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_ZERO
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_ZERO
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_FINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_FINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_INFINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_INFINITE
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::INFINITY
/Users/fzondlo/.rvm/gems/ruby-2.0.0-p195/gems/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::NAN
=> true
我已经尝试过两次重新安装Active Record 4.1.8，两次都遇到了同样的问题。我也尝试重新安装bigdecimal
gem uninstall bigdecimal
gem install bigdecimal
并没有解决它。我目前安装了bigdecimal-1.2.5。