89-101 pages translation

Assigned to

• 권경모/@kkweon

Mandatory reviewer

• 정현석/@nicewook

• 이경석/@lee-kyungseok

Conversion 89

Interface Conversions 89

Type assertion 91

Runtime Type Assertion 92

Interface Pollution 94

Remove Interface Pollution 96

Mocking 98

Package To Mock 98

Client 100