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PNG's magic bytes are 89 50 4E 47, but detectImageMime only checked
the first three. The WebP branch in the same function correctly checks
all four bytes of its signature — the PNG path was clearly an oversight.
Extend the PNG check to include 0x47 ('G') for consistency and to
eliminate the (admittedly rare) false-positive window.
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| dingtalk | ||
| plugin-example | ||
| telegram | ||
| weixin | ||