Merge type increases type instantiations count drastically

[chbdetta]

I ran into error TS2589: Type instantiation is excessively deep and possibly infinite. and get this result with --extendedDiagnostics:

Files:                        1527
Lines of Library:            28535
Lines of Definitions:        76407
Lines of TypeScript:         17557
Lines of JavaScript:        195957
Lines of JSON:                   0
Lines of Other:                  0
Nodes of Library:           117553
Nodes of Definitions:       273566
Nodes of TypeScript:         72611
Nodes of JavaScript:        825495
Nodes of JSON:                   0
Nodes of Other:                  0
Identifiers:                431173
Symbols:                    410281
Types:                       90155
Instantiations:            6707979            <========== the instantiations count exceeds the limitation
Memory used:               531849K
Assignability cache size:    53667
Identity cache size:          1231
Subtype cache size:           1904
Strict subtype cache size:    8066

tsc has a 5 million limitation on instantiation counts

After I replace all the Merge with simple intersection with Omit, I get this:

Files:                        1527
Lines of Library:            28535
Lines of Definitions:        76407
Lines of TypeScript:         17522
Lines of JavaScript:        195957
Lines of JSON:                   0
Lines of Other:                  0
Nodes of Library:           117553
Nodes of Definitions:       273566
Nodes of TypeScript:         72570
Nodes of JavaScript:        825495
Nodes of JSON:                   0
Nodes of Other:                  0
Identifiers:                431152
Symbols:                    448585
Types:                       80108
Instantiations:             514523         <========== 10x smaller
Memory used:               556046K
Assignability cache size:    77690
Identity cache size:          1259
Subtype cache size:           2096
Strict subtype cache size:    8430

Using type-fest@2.3.4