The number of languages that should be supported is: as many as it takes to get the job done.
My project uses 42 languages. Some of those are used to make shipping binary (e.g., C++) or shipped with the product (e.g., JavaScript), others are used to make the shipping binary (e.g., Make, CMD, BAT), and others are used to facilitate development (e.g., Python, Ruby).
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The number of languages that should be supported is: as many as it takes to get the job done.
My project uses 42 languages. Some of those are used to make shipping binary (e.g., C++) or shipped with the product (e.g., JavaScript), others are used to make the shipping binary (e.g., Make, CMD, BAT), and others are used to facilitate development (e.g., Python, Ruby).