Function html

Tagged template literal for trusted HTML content.

Performance: Zero-copy for static templates, optimized fast paths for single-value interpolation. String cache reduces repeated normalization overhead.

Behavior:

• Arrays flatten without separators: [1,2,3] → "123"
• Falsy values excluded except 0
• Whitespace normalized between tags
• No XSS protection - use safeHtml for untrusted input

const name = 'Alice';
html`<h1>Hello, ${name}!</h1>`
// "<h1>Hello, Alice!</h1>"
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const items = ['a', 'b', 'c'];
html`<ul>${items.map(x => html`<li>${x}</li>`)}</ul>`
// "<ul><li>a</li><li>b</li><li>c</li></ul>"
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const count = 0;
html`<div>Count: ${count}</div>`
// "<div>Count: 0</div>" (zero preserved)
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