[deadstrobe5]

Value.Convert matched object properties by building a RegExp (^key$) for each property on every call and testing it against every key of the value. This changes it to look each property key up in a Set of the value's own keys, the same way Value.Default already does. The additionalProperties branch still gets the same regex entries as before.

This also fixes keys with regex characters in them. Before, a property named $id was never converted (the $ ends the pattern), a.b also converted a sibling axb, and d( threw Invalid regular expression. I added a test for these in test/typebox/runtime/value/convert/object.ts.

Value.Convert	Before	After	Speedup
1 object, 5 properties	3.1 us	1.7 us	1.8x
1 object, 20 properties	17.5 us	8.4 us	2.1x
1000 objects, 20 properties	17.7 ms	9.0 ms	2.0x
1000 objects, 50 properties	64.1 ms	22.0 ms	2.9x

Measured on Node 24 (Ryzen 5 5600X) with the old and new source loaded in the same process, 9 alternating rounds, medians. An empty object is unchanged. I also ran old and new side by side over 90,000 random schemas and values (nested objects, optional properties, unions, intersects, records, additionalProperties) and the output was identical. npm test passes.