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Puppet 2.7.19 introduced a change that don't allow resource titles to be
something else that a string. from the puppet 2.7.19 changelog:
Don’t allow resource titles which aren’t strings
It was possible to create resources whose titles weren't strings, by
using a variable containing a hash, or the result of a function which
doesn't return a string. This can cause problems resolving relationships
when the stringified version of the title differs between master and
agent.
Now we will only accept primitives, and will stringify them. That is:
string, symbol, number, boolean. Arrays or nested arrays will still be
flattened and used to create multiple resources. Any other value (for
instance: a hash) will cause a parse error.
currently, it's much easier to iterate over a hash in puppet than over
an array, cause every resource you call iterating over an array would
need a unique name, and you don't have this in arrays.
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