typename( typeof( 4.2 ))
This some time return "Number (Decimal)", or return"数字（小数）"，how i can make it return English only?
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The type names are returned depending on the language settings in your profile.
This is an important concept - expressions will run with the context of the current user. So suppose you're using different logic depending on the type (e.g. if the type is decimal show one field type; if it's integer show a different field type). It's better to use only typeof() since that returns a number and it would be consistent in every language.