Clamp negative alpha values in AlphaTrait - #53
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The alpha() setter clamped only the upper bound, so a negative value passed through and serialized to a string the constructor rejects (Rgba/Hsla, and garbage hex for Hexa). Clamp the lower bound too, as the sibling red/green/hue/saturation/lightness setters already do.
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AlphaTrait::alpha()clamps only the upper bound (min((float) $alpha, 1.0)), so a negative value passes through and then serializes to a string the class's own constructor rejects. Round-trip breaks for all three alpha types:The sibling setters (red/green/blue, hue, saturation, lightness) already guard both bounds;
alpha()only guarded the upper one. This clamps the lower bound as well, keeping the existing silent upper clamp. Added boundary tests across Rgba/Hsla/Hexa: negative clamps to 0 and round-trips, >1 still clamps to 1, in-range values pass through unchanged.