Switch early return to Unimplemented in Partial Eval

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Benchmark for 7b8918c

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Test	Base	PR	%
Array append evaluation	331.5±3.79µs	336.7±3.03µs	+1.57%
Array literal evaluation	189.7±0.87µs	197.1±3.53µs	+3.90%
Array update evaluation	412.1±4.27µs	417.6±2.84µs	+1.33%
Core + Standard library compilation	19.0±0.48ms	19.7±0.75ms	+3.68%
Deutsch-Jozsa evaluation	5.2±0.05ms	5.2±0.17ms	0.00%
Large file parity evaluation	34.7±0.38ms	34.5±0.29ms	-0.58%
Large input file compilation	12.6±0.17ms	13.0±0.25ms	+3.17%
Large input file compilation (interpreter)	49.9±1.42ms	49.0±0.90ms	-1.80%
Large nested iteration	32.9±0.47ms	33.2±0.25ms	+0.91%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1558.2±40.43µs	1570.4±52.14µs	+0.78%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.8±0.08ms	7.8±0.07ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1430.0±93.12µs	1427.3±49.95µs	-0.19%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	27.4±0.55ms	27.6±0.25ms	+0.73%
Teleport evaluation	89.7±6.98µs	89.3±4.40µs	-0.45%