Fix: normalize watermark alpha to 0-1 range for Intervention Image v4#450

Merged

ADmad merged 3 commits intothephpleague:4.xfrom

deluxetom:4.x-transparency

Apr 7, 2026

Commits on Apr 2, 2026

fix: normalize watermark alpha to 0-1 range for Intervention Image v4

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test: verify watermark alpha is normalized to 0-1 range for insert()

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style: use Yoda comparison in watermark alpha test

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