feat(core): add unique identifier for signals

[JoviDeCroock]

fixes #402

This allows for multiple versions of signals to be in a bundle and still be properly identified as signals.

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@preact/signals-core	Minor

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[github-actions]

Size Change: +91 B (0%)

Total Size: 78.1 kB

Filename	Size	Change
docs/dist/assets/client.********.js	46.7 kB	-5 B (0%)
docs/dist/assets/index.********.js	833 B	-2 B (0%)
docs/dist/assets/signals-core.module.********.js	1.46 kB	+31 B (+2%)
docs/dist/assets/signals.module.********.js	2.02 kB	+1 B (0%)
docs/dist/demos-********.js	3.35 kB	+1 B (0%)
packages/core/dist/signals-core.js	1.54 kB	+35 B (+2%)
packages/core/dist/signals-core.mjs	1.56 kB	+30 B (+2%)

ℹ️ View Unchanged

Filename	Size
docs/dist/assets/jsxRuntime.module.********.js	281 B
docs/dist/assets/preact.module.********.js	4.02 kB
docs/dist/assets/style.********.js	21 B
docs/dist/assets/style.********.css	1.21 kB
docs/dist/basic-********.js	244 B
docs/dist/nesting-********.js	1.13 kB
docs/dist/react-********.js	238 B
packages/preact/dist/signals.js	1.27 kB
packages/preact/dist/signals.mjs	1.22 kB
packages/react-transform/dist/signals-*********.js	2.79 kB
packages/react-transform/dist/signals-transform.mjs	2.66 kB
packages/react-transform/dist/signals-transform.umd.js	2.91 kB
packages/react/dist/signals.js	1.35 kB
packages/react/dist/signals.mjs	1.29 kB

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[marvinhagemeister]

Great idea. Would make checking for signals a bit easier 👍

[JoviDeCroock]

@marvinhagemeister do you agree with brand as the property name, had to change it due to type conflicting with ReactElement

[marvinhagemeister]

@JoviDeCroock brand is fine. Fits in line with the whole "branded types" idea