Smile data interchange format is a binary data format created in 2010 by Tatu Saloranta.
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git clone https://github.com/FasterXML/smile-format-specificationSmile is a computer data interchange format based on JSON. It can also be considered a binary serialization of the generic JSON data model, which means tools that operate on JSON may be used with Smile as well, as long as a proper encoder/decoder exists for the tool. The name comes from first 2 bytes of the 4 byte header, which consist of Smiley ":)" followed by a linefeed: choice made to make it easier to recognize Smile-encoded data files using textual command-line tools.. Read more on Wikipedia...