var.insert
bool insert(T)(size_t index, T rhs) @safeInsert rhs at position index (0..length). Converts Type.NULL to empty array. Returns true on success, false if index is out of range.
bool insert(T)(size_t index, T rhs) @safeInsert rhs at position index (0..length). Converts Type.NULL to empty array. Returns true on success, false if index is out of range.