r - 为什么我在 R 的 agrep 中翻转 pattern 中的字符串和 x 时没有得到相同的模糊匹配结果？

Question

所以下面的命令给了我一个匹配：
agrep(pattern = 'Ned Stark', x = 'Ned Stark**DUPL ENTRY', max.distance = 0.15, costs = NULL, ignore.case = TRUE, value = FALSE, fixed = TRUE, useBytes = FALSE)
但是当我翻转两个字符串时，我不再得到匹配
agrep(pattern = 'Ned Stark**DUPL ENTRY', x = 'Ned Stark', max.distance = 0.15, costs = NULL, ignore.case = TRUE, value = FALSE, fixed = TRUE, useBytes = FALSE)