some dlig deriving from Source Han Sans need to be killed

[747]

As I confirmed with Sarasa Mono J, turning on dlig feature unexpectedly activates kana ligatures that are presumably shipped with Source Han Sans.

For example:

-<< >>- <<= >>=
ペニヒボルトカイリコーポヘルツインチほかより

becomes:

Those compact ligatures exist for Japanese newspaper typesetting, and not what you want in your source code (most critically, they are indistinguishable with precombined compatibility characters). I think we need to remove or shunt the table aside somehow.

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