ruby backwards-compatibility ruby-1.9 ruby-1.8

What's discouraging you from writing ruby 1.9-specific code?

So far, I've been merely using YARV (ruby 1.9) as merely a faster implementation of ruby than ruby 1.8, and ensured that all of my code is backwards-compatible with ruby 1.8.6. What circumstances, if any, are stopping you from writing 1.9-specific code?

One reason per answer.

Solution

Also, if we're talking about rails, then the problem there is the compatibility of gems/plugins with ruby 1.9. I'm sure everyone who wants to upgrade to 1.9 keeps an eye on ~~isitruby19.com~~

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