Description:
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For consistency with other entries, the "Return Values" section should mention the normally-expected return, and then all of the "odd" return possibilities.  For explode, the normal return value is not mentioned in this section (i.e. an array of strings).

I'd suggest pre-pending the existing Result Values paragraph with the following paragraph, copied from the description above:

Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string delimiter.