byteSize

• function (new in 1.38)
• Returns a byte size value spelled out in numbers and words. The text that results from this function can be converted back to a number using the value() function.
• Examples:

         put byteSize(5242880) -- "5 megabytes" 

• type for "is a" operator (new in 1.49)
• unit type (new in 1.49)
  • base unit: byte
  • synonyms: dataSize, memorySize