Fix

"cannot use X as type Y in assignment" error occurs because Go is a statically typed language and you are trying to assign a value of one type to a variable of an incompatible type. You must explicitly convert the value to the target type using a type assertion or a type conversion.

// If X is an interface and Y is a concrete type:
var y Y = x.(Y)

// If X and Y are basic types (e.g., int to float64):
var y Y = Y(x)

Go requires that data types match exactly when you assign one variable to another. Think of it like trying to pour a square peg into a round hole; the compiler stops you to prevent errors. You must explicitly reshape the data (convert it) to fit the destination variable's type.