Best way to convert strings to symbols in hash

What’s the (fastest/cleanest/straightforward) way to convert all keys in a hash from strings to symbols in Ruby?

This would be handy when parsing YAML.

my_hash = YAML.load_file('yml')

I’d like to be able to use:

my_hash[:key] 

Rather than:

my_hash['key']

Here’s a better method, if you’re using Rails:

params.symbolize_keys

The end.

If you’re not, just rip off their code (it’s also in the link):

myhash.keys.each do |key|
  myhash[(key.to_sym rescue key) || key] = myhash.delete(key)
end