From d528e9004d3773348b3c0a5f18c127a1bb1621bf Mon Sep 17 00:00:00 2001
From: john verzani <jverzani@gmail.com>
Date: Tue, 12 Mar 2024 17:57:25 -0400
Subject: [PATCH] Issue 421 (#422)

* fix undesired type promotion to Float64

* version bump

* typo
---
 Project.toml           | 2 +-
 src/hybrid.jl          | 2 +-
 test/test_find_zero.jl | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Project.toml b/Project.toml
index 652ada9f..21aeb577 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "Roots"
 uuid = "f2b01f46-fcfa-551c-844a-d8ac1e96c665"
-version = "2.1.2"
+version = "2.1.3"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
diff --git a/src/hybrid.jl b/src/hybrid.jl
index b3043390..712bf5db 100644
--- a/src/hybrid.jl
+++ b/src/hybrid.jl
@@ -80,7 +80,7 @@ function solve!(
         r, a, b = state0.xn1, state.xn0, state.xn1
         Δr = abs(r - b)
         Δx = abs(b - a)
-        ts, TB = 1e-3, 1e2 # too small, too big
+        ts, TB = one(r)/1000, 100*one(r) # too small, too big
         if Δr >= TB * Δx
             adj = true
             r = b + sign(r - b) * TB * Δx  ## too big
diff --git a/test/test_find_zero.jl b/test/test_find_zero.jl
index 6f53885f..ef4e136d 100644
--- a/test/test_find_zero.jl
+++ b/test/test_find_zero.jl
@@ -36,6 +36,7 @@ struct Order3_Test <: Roots.AbstractSecantMethod end
         @test find_zero(sin, 3.0, m) ≈ pi
         @test find_zero(sin, big(3), m) ≈ pi
         @test find_zero(sin, big(3.0), m) ≈ pi
+        @test find_zero(x -> x^2 - 2.0f0, 2.0f0, m) ≈ sqrt(2) # issue 421
     end
 
     ## defaults for method argument