rubensworks / jsonld-context-parser.js / 6784004907

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Remove deep cloning of contexts during parsing

This significantly improves parsing performance.

I have also done a (small) benchmark of these changes. As can be seen the time taken to parse a context with these changes significantly decreases (in particular it is now 20x faster to parse a VC context).

Before:
Parse a context that has not been cached; and without caching in place x 78.17 ops/sec ±0.73% (78 runs sampled)
Parse a context object that has not been cached x 2,280 ops/sec ±0.65% (91 runs sampled)

in #72:
Parse a context that has not been cached; and without caching in place x 123 ops/sec ±0.78% (84 runs sampled)
Parse a context object that has not been cached x 5,417 ops/sec ±0.70% (87 runs sampled)

After (in this PR):
Parse a context that has not been cached; and without caching in place x 1,714 ops/sec ±0.78% (84 runs sampled)
Parse a context object that has not been cached x 8,902 ops/sec ±0.70% (87 runs sampled)

477 of 477 branches covered (100.0%)

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53 of 53 new or added lines in 2 files covered. (100.0%)

553 of 553 relevant lines covered (100.0%)

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