Cannot parse "シークヮーサー"

[MihailsKuzmins]

I would like to parse "シークヮーサー", but I get the "key not found" exception.
Could you please advise how it can be done? Do I use the CustomKanaMapping and CustomRomajiMapping incorrectly?
Exception message: "The given key 'ゎ' was not present in the dictionary."

		[Fact]
		public void Aaa()
		{
			const string input = "シークヮーサー";
			var wanaKanaOptions = new WanaKanaOptions
			{
				CustomKanaMapping = new Dictionary<string, string>
				{
					{"ゎ", "wa"},
					{"ヮ", "wa"}
				},
				CustomRomajiMapping = new Dictionary<string, string>
				{
					{"ゎ", "wa"},
					{"ヮ", "wa"}
				}
			};

			var result = WanaKana.ToRomaji(input, wanaKanaOptions);
		}

[MartinZikmund]

Hey @MihailsKuzmins,

sorry I missed your issue, I will take a look and investigate.

[MihailsKuzmins]

@MartinZikmund, thank you for the library.
It looks like you cannot find time for this issue, so I'm closing it.
As for me, I have another solution for romanising this katakana sequence