[Rd] Bug in tools::toTitleCase

[Carl Ganz]

Hello,

I believe there is a bug in tools::toTitleCase, because it converts NAs
into the string "NA".

tools::toTitleCase(NA_character_)

The issue appears to be with the C function splitString since this also
returns "NA":

.Call('C_splitString', NA_character_, " -/\"()\n", PACKAGE = "tools")

Kind Regards,
Carl Ganz

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