Dict::Match() does not check for exact match

[coin3x]

Broken since be2492c

OpenCC/src/MarisaDict.cpp

Lines 48 to 52 in 539e4e9

	Optional<const DictEntry*> MarisaDict::Match(const char* word,
	size_t len) const {
	const marisa::Trie& trie = *internal->marisa;
	marisa::Agent agent;
	agent.set_query(word, (std::min)(maxLength, len));

OpenCC/src/DartsDict.cpp

Lines 55 to 60 in 539e4e9

	Optional<const DictEntry*> DartsDict::Match(const char* word,
	size_t len) const {
	Darts::DoubleArray& dict = *internal->doubleArray;
	Darts::DoubleArray::result_pair_type result;
	dict.exactMatchSearch(word, result, (std::min)(maxLength, len));

Example Dict:
爲 -> 為

maxLength: 3

std::string query("爲123");
dict->Match(query);

len: 6

Expected: Optional::Null
Actual: DictEntry 爲 -> 為

[BYVoid]

Thanks.