Rantly#literal で値をそのまま返します
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サンプル
Rantly(5){literal("test")}
# => ["test", "test", "test", "test", "test"]
Rantly(5){literal("test")}
# => ["test", "test", "test", "test", "test"]
# 固定値とランダム文字列を50%の確率で生成
Rantly(5){choose literal("test"), string}
# => ["test", "test", "WS~&fy", "test", "iZ'}dD"]
Rantly(5){choose literal("test"), string}
# => ["test", "ObZpu~", "test", "test", ")~Tny6"]