*._match functions don't work with certain foreign characters.

[deschen1]

When using one of the match functions (i.e. prefix_match in my case) it returns weird character symbols for many "foreign" characters, e.g. German ä, ö, ü or ß or basically all Hindi words/characters.

Example:

labels <- c("test", "Vie privée", "Vie", "फेसबुक के विकल्प के तौर पर Insagram ऐप का इस्ते")
trie <- trie(keys = labels, values = labels)
a <- prefix_match(trie, labels)

which returns:

[[1]]
[1] "test"

[[2]]
[1] "Vie privée"

[[3]]
[1] "Vie"        "Vie privée"

[[4]]
[1] "फेसबà¥\u0081क के विकलà¥\u008dप के तौर पर Insagram à¤\u0090प का इसà¥\u008dते"