... I send out a list of most interesting libraries and apps in the "Go" section to about 1100 subscribers.
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Parse and modify Go struct field tags
Change tags of structures' fields in runtime without copying of data in Go.
An idiomatic Go (golang) validation package. Supports configurable and extensible validation rules (validators) using normal language constructs instead of error-prone struct tags.
hacky code that tries to force the compiler to verify that your fields exists when interacting with field tags.