Arrays are evaluated in scalar context and the result is converted to a string.

Not just arrays, but all other expressions.

Everything else is evaluated as an expression and the result is converted to a string

"as an expression" is redundant since only expressions can be evaluated, and you forgot to mention scalar context. Perhaps "All other expressions are evaluated in scalar context and their result is converted to a string."

In reply to Re^3: hash key stringification by ikegami
in thread hash key stringification by ig

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