Return whether the string begins with a string.

template<
    typename T>
constexpr bool
starts_with(
    T const& t) const noexcept;
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constexpr bool
starts_with(
    basic_static_string::const_pointer s) const noexcept;
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Return whether the string begins with a character.

constexpr bool
starts_with(
    basic_static_string::value_type c) const noexcept;
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