chore: general performance optimisations

[JoviDeCroock]

• use an EMPTY_STR for coercion to reduce allocation of empty strings as well as for empty string checks
• only call encodeEntities when the entity in question is a string, this removes always calling the function and an unnecessary coercion
• ensure we leverage x = x + y rather than x += y
• ensure we leverage our isArray helper
• guard for some code-paths that are only possible with i.e. a class-component (avoids expensive object checks)
• skip function type properties

Results from CI (locally saw a bit larger increases, maybe node version?)

Text:
baseline x 259.905 ops/sec ±2.52 (83 runs sampled)
current x 273.589 ops/sec ±2.15 (87 runs sampled)
Fastest is current

SearchResults:
baseline x 1,330.724 ops/sec ±3.20 (87 runs sampled)
current x 1,365.269 ops/sec ±2.88 (89 runs sampled)
Fastest is current,baseline

ColorPicker:
baseline x 6,429.806 ops/sec ±3.09 (91 runs sampled)
current x 7,311.005 ops/sec ±3.29 (86 runs sampled)
Fastest is current

Stack Depth:
baseline x 183.456 ops/sec ±4.74 (67 runs sampled)
current x 194.845 ops/sec ±3.77 (72 runs sampled)
Fastest is current,baseline

[changeset-bot]

🦋 Changeset detected

Latest commit: ec50987

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
preact-render-to-string	Patch

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[marvinhagemeister]

Nice, this is great!