Introduced 'string.slice' Object

Since 0.23.8 version it is possible to use string.slice object just like this:

"Привет".slice 1 2

Here, slice object returns “ри” string, which is a substring of “ри” string from the specified start position and with the length len.

If above parameters will be out of bound, slice will return an error object instead of a new string object.

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